The story with Reddit attempts to make their API paid, as well as the recent YouTube policy changes that prioritise corporations over the average users in terms of monetisation revenue show a quite clear picture: we can no longer trust the major platform-holders, since they seem to have firmly stepped into the maturity stage of their business model.
In short, it seems that the venture capital institutes are no longer going to put up with the losses incurred as the result of the ‘growth at all costs’ policies. And it is not just the end of the free cheese, it is a problem for those who have invested heavily in content-making on these platforms and now get a lot of trouble. They don't need to blame the ‘evil capitalist CEOs’ of those corporations, they need to blame those who has been inflating these corporations with money in hope to get a market share with the cheap money right from the printing press. It's like a demo version of a market bust, but small and relatively harmless. But as well as in case of a real market boom, the malinvesting venture funds and people behind the printing press going ‘brrrr’ are to blame.
Self-hosting is, of course, more expensive thing for an independent creator, but on the other hand, self-hosted and decentralised solutions allow for more freedom, especially in the situations when the illegal content becomes an increasingly minor sub-set of the content unwanted by the corporate platforms that are bent on their market share as the old Kashchey on his treasures.
The independent creators must understand that the party's over: all those who have not managed to grow to a certain level are going to lose more than they gain with Google, Reddit, Twitter or any other major and well-known platform.