If there's an experimental feature you want to test out on your site, you should be able to register for the origin trial. I don't think it's something where Go

If there's an experimental feature you want to test out on your site, you should be able to register for the origin trial. I don't think it's something where Google decides who can register? Origin trials are a reaction to the failure of shipping new features under prefixes, where those experimental features fossilized. By restricting origin trials only to sites that explicitly opt in and making those registrations time limited it's possible to get feedback on whether an experimental feature works without sites becoming dependent on it. (Disclosure: I work for Google on unrelated things; speaking only for myself)