I have asked myself the same question.. I think part of their continued existence is just being a public company.. investments from state-affiliated actors.. then there are loans against assets as minimal interest, favtoring some manipulated user metrics like Elon found out with Twitter. Then there are also some ad revenues. Everybody around me uses marketplace and people can boost those for a few so I'm sure that happens.. I think it's probably a scotch-tape-reinforced paper house right now.