Your answer didn't answer anything and was a bit terse. Their question was valid.
It looks like the answer is that they're charging some sort of licensing fee per project using Supabase or that they have a hosted option for people who don't want to run their own Supabase instance(s): https://supabase.com/pricing.
supabase ceo here - you're right about the hosted option, but we don't charge any license fees.
Supabase is very liberally licensed (MIT, Apache2, PostgreSQL, depending on the tool), and we don't plan to pursue any revenue from licensing. We make enough money from database hosting.
It looks like the answer is that they're charging some sort of licensing fee per project using Supabase or that they have a hosted option for people who don't want to run their own Supabase instance(s): https://supabase.com/pricing.