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).
Now everyone is used to using the internet to organize their travel and get the best deals on anything they can - and so websites like couchsurfing become a free booking.com alternative for people who have no interest in the human experience side of it.