Book publishing was pretty winner-take-all, until Kindle Unlimited (and its close relative, the many serial-fiction "unlock new chapters with coins" websites and apps) came along, and basically changed everything for many indie authors.

Before, you needed to woo a publisher, because you needed to be in bookstores, because you needed a certain threshold of word-of-mouth to be stirred up around your releases, in order to get sales that would let you make enough to cover your own advances.

But with the Kindle Unlimited model (users pay a flat subscription fee; authors get paid per page read) it's now practical to earn a living just by writing and maybe talking your book up on your own personal social media — no need to find a publisher, no need to make it into bookstores, no need to advertise heavily, no need to make big-hit releases, etc. Just pump out a constant stream of stuff that some people like enough, and you get money.

Could there be a Kindle Unlimited for games? All games are free under subscription; devs get paid proportional to play time?

A quick Google suggests that Apple Arcade might actually be doing this, but Apple Arcade devs are apparently under NDA not to talk about the revenue model. (Maybe because Apple doesn't want the other bigcorps realizing this is working well and being a fast-follower?)