The generative tools teachers actually use in US public schools are selected several layers above the classroom. The purchasing structure filters the market before any teacher sees it.
The district is the customer, not the teacher
Vendors sell to technology directors and curriculum offices. A teacher's preference matters only insofar as it reaches those offices through a pilot or a department request.
This inverts the consumer software pattern, where individual adoption spreads upward. In districts, approval comes first and use follows, or it does not happen at all.
Tools that succeed are the ones built for a district evaluation, which rewards documentation, rostering support and administrative controls over classroom appeal.
Student privacy law sets the entry requirement
Federal education records law and a layer of state student privacy statutes govern what a vendor may do with student data. Districts encode these in a standard data agreement.
A vendor unwilling to sign the district's agreement is out of the process regardless of product quality, and small vendors frequently cannot meet the terms.
The practical effect is consolidation, because compliance overhead is a fixed cost that favors companies large enough to absorb it.
Funding cycles decide timing
District technology spending runs on annual budgets, bond measures and categorical state or federal funds, each with its own eligibility rules and calendar.
A tool may be approved on the merits and still wait for a funding source that permits software subscriptions rather than only hardware or professional development.
Purchases therefore cluster at particular points in the year, and a decision missed by a few weeks can slip a full cycle.
State master contracts do quiet standardization
Many states negotiate master agreements that districts may purchase against without running their own procurement. Getting onto that list is worth more than most sales activity.
For a small district with no procurement staff, the state list is effectively the catalog of available options.
Statewide standardization follows from convenience rather than from any state having decided which tool schools should use.
Training determines whether the license gets used
Districts routinely license tools that see little classroom use, because the purchase was funded and the professional development was not.
Teacher time is the scarcest resource in the building, and a tool requiring an unfunded hour to learn competes against grading and planning.
The districts reporting real classroom change paired the license with paid time to learn it, which is a budget decision rather than a technology one.