So that impact claims have a basis, the proposed metrics to track:

Group	Typical metrics
Business	Active Rooms; active organizations/users; share of accounts using >1 room type; infrastructure cost per Room; contribution margin
Users	Time from sign-up → first live session; return rate; sessions per Room; estimated savings versus stitching tools
Society	Teachers/classes/learners reached (by region/income); merchants & revenue generated for small sellers; community organizations/civic events; self-host share; number of languages

Rule: never publish user/impact numbers that have not been measured, in any material. External market figures (section 2) must carry sources and an "indicative" caveat.