Not only that, such services - unlike a megaphone or the agora - are a) incentivised to keep you there, b) algorithmically curate the content that you view, and

Not only that, such services - unlike a megaphone or the agora - are a) incentivised to keep you there, b) algorithmically curate the content that you view, and c) are businesses and their responsibility is first and foremost the shareholders and not the public.