Your post inspired me to pull my old PS3 Slim off the shelf and give it a shot. Fortunately it is one of the ones capable of custom firmware. I successfully jailbroke it and am now running custom firmware, next I just have to figure out how to do anything useful with it, lol.
Marketplace was fantastic for buying and selling all sorts of stuff for years, but it is now plagued with fake listings and scams and all kinds of undesirable shit now. The scammers seem to have no problem whatsoever cranking out new accounts on the regular, and Facebook doesn’t seem to give a shit. Any time I report any of the scam listings I get a response from FB about 3 weeks later saying they did nothing wrong, so they took no action. Fuck Facebook.