Many people are quick to jump to it isn't illegal, the First Amendment/ Charter / government does not guarantee such things, and of course they don't, the key word everybody forgets to think of is while there are not legal ramifications, there are consequences for violating your principles and promises.

I believe it is analogous, though obviously not equivalent in any sense, to John Locke's social contract theory where certain natural rights are offered to the state in return for protection of people's other rights. We offer our time, our friends, our minds, and our clicks and subscriptions to a place and allow them to own it and use it for profit, in return for the promise that we would be allowed to express ourselves and that our content would be protected.

I believe this principle applies to any place even smaller niches such as subreddits whether it be a community of thousands or in some cases millions of users, even KiA, and also of course reddit itself.