They aren't yet putting up barriers since their sole purpose is people connecting to each other. There is every chance they do move to restricting access but I think it would be the death of Twitch and certainly Twitter if they started doing so. Social media doesn't require us to trust some group of people to choose our content for us and as such is a lot less prone to that bias and billionaire control. That isn't to say the billionaires don't have an effect, on Twitter what people are exposed to by the algorithm is very intentional and controlled as is the front page roll on Twitch, but unlike mainstream media its still possiblr to see and connect with the unfavoured content and grass roots movements can still form. I would prefer this was all on the fediverse but its not where the people are yet.