That would probably depend on the instance creators. Donations are paying the way so far, but maybe someone will test out an instance with a registration fee or something. I don’t see that working out unless every other instance is in dire straits and super unstable because they’re running out of money.

This is why I like SomethingAwful forums too. Open since 1999 and an account costs $10. Just a little barrier to entry keeps out the worst people and trolls help fund the site by reregistering!