Several approaches have been developed for artists wanting to limit training use of their work.
Crawler directives
Signals on websites asking not to be collected.
Which depends on compliance.
Adversarial perturbation
Tools altering images to disrupt training.
Which research suggests are of limited durability.
Opt-out registries
Registering works as excluded.
Which requires developer participation.
Collective and legal action
Class actions and organisational campaigns.
Which is where the substantive pressure has come from.
What actually works and what does not
Crawler directives work if the crawler respects them. Registries work if developers consult them. Adversarial tools that alter images to disrupt training have been shown by researchers to be circumventable and to degrade over time.
Which leaves collective legal and political action as the approach with the most demonstrated effect.
That is not a comfortable conclusion for individual artists looking for something they can do personally, and it is what the evidence currently supports.
Watermarking own work
Visible marks affecting presentation.
Which is a trade-off many reject.
Platform choices
Hosting on services with stated policies.
Which varies in enforceability.
Documentation
Recording creation process and dates.
Which supports any later claim.
Collective bodies
Where individual action has least leverage.
Why these questions are unusually hard to settle
Creative work has always involved learning from other people’s work, and the law reflects that: ideas and styles have never been protected, only specific expression. That principle exists for good reasons and nobody wants it reversed.
What has changed is that a capability which previously required years of practice now requires a sentence, at essentially unlimited volume. Whether that is a difference of degree or of kind is the actual argument, and it is not resolvable by pointing at existing law, because existing law was not written with this in view.
Where the practical action is
Not, so far, in courts. Collective bargaining has produced enforceable terms faster than litigation has produced rulings, provenance standards have advanced faster than detection, and platform and publisher policies have moved faster than legislation.
That means the rules governing this in practice are currently a patchwork of contracts, platform terms and professional norms, all of which vary and none of which is comprehensive.
What to do in the meantime
If you commission creative work, specify what tools may be used and what disclosure you expect. If you produce it, be clear with clients about what you did. If you publish it, have a policy and state it. If you consume it, check provenance rather than trying to spot artefacts.
All four are available now, none depends on the law being settled, and between them they cover most of the situations that actually arise.
A general note
Copyright, contract and likeness law differ substantially between countries and are developing quickly. Nothing here is legal advice, and anything with money or rights attached warrants a qualified adviser familiar with the relevant jurisdiction.
What working creatives actually seem to want
Across surveys, union negotiations and professional body statements, the demands are fairly consistent: consent before their work is used in training, some form of compensation when it is, credit where their contribution persists, and disclosure so that clients and audiences know what they are looking at.
None of those is a demand that the technology stop existing, which is worth noting given how the debate is frequently characterised. They are requests for the same terms that apply when any other use is made of someone’s work.
The argument on the other side
Requiring consent for training would be practically impossible for datasets already assembled, would advantage large companies able to license at scale over smaller developers and researchers, and would sit awkwardly with a legal tradition that has never required permission to learn from published work.
Both positions are held seriously by people who have thought about them, and the resolution is likely to be legislative and messy rather than clean in either direction.
One closing observation
Most of the heat in this argument comes from treating a set of separate questions as one. Whether training was lawful, whether outputs can be owned, whether a style can be protected, whether disclosure should be required and whether the market effects are acceptable are five different questions with five different answers.
Separating them does not resolve any of them, and it makes the disagreement considerably more tractable than it appears when they are argued together.
Where to follow this properly
Professional bodies for the relevant discipline publish position statements, survey data and practical guidance, and they are considerably better informed than general coverage. Court filings and judgments in the major cases are public. Standards bodies publish their specifications openly.
All of that is more useful than commentary, and most of it is free. The field is moving quickly enough that anything written more than a year ago should be checked against the current position before it is relied on.