Very fond memories of couchsurfing met very nice people both as a traveler and a host. But this was long ago. Not sure this will ever work again though
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Couchsurfing used to be a relatively niche thing which allowed it to work and thrive. The percentage of freeloaders or bad actors was low enough not to be a problem.
But now with more people being aware of it/its alternatives, the percentage of bad actors would increase too (and maybe not even proportionally to the number of good actors).
That demographic is a lot older now, and the younger generation has other interests and expectations which couchsurfing likely does not appeal to.