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Valve runs its massive PC gaming ecosystem with only about 350 employees
(arstechnica.com)
This is a most excellent place for technology news and articles.
They could easily prevent devs that abandoned an early access title from launching another one. They could check if the devs have a reasonable business plan and are able to fulfill their promises. They could vet them and check if they did manage to release some games. And so on. It is not impossible and would help us gamers, because nobody wants abandoned games.