Lol wut? you get all of your auth data in your own db in 1 cli command. You are not tied to any on db provider. On top of that you get hundreds of auth features like oauth providers (I use it to allow users to log in via google, apple, github) and the best part it's free. Not saying Supabase and Clerk are bad, but they cost money. With better auth you pay exactly $0 for all of this.
Or I could use a web framework that offers that out of the box, and its free and lives in my database, wherever I want.