[khedoros1]

Since friction in creating a new account is so low, the only real signal about the controller of the account is their behavior on the platform. Bots trying to sell things are rampant. Advertising (including self-promotion) is seen as a kind of spam by most of Reddit.

That being said, anyone can start a subreddit. You start your own and post whatever you want, or you spend some time in the individual communities, learn their norms, learn what each one considers acceptable to post. Something completely normal in one subreddit will be completely unacceptable in another.