I occasionally bring random IT-related stuff home from work - usually equipment that's too old to be of use for the client anymore and it's marked for disposal. I collect old ThinkPad laptops and every so often I'll find one stashed away in a closet and bring it home. Sometimes I keep them for myself, but sometimes I sell them off. When I would sell stuff I would usually post it up on feeBay and had relatively good experiences overall.
That luck ran out in 2020 when some fool bought a "vintage" machine from me (ca. 2004, with a single-core CPU, less than a gig of RAM and running the factory-installed pre-SP2 Windows XP). He expected it to boot up and connect to the wi-fi so he could do whatever he wanted out-of-the box as if it was brand-new, and when it couldn't connect to wi-fi he took it to Staples (of all places) who so astutely told him the wireless card had gone bad. (in reality he was trying to connect to a WPA encrypted network with an XP install without SP2, and MS didn't introduce WPA support to XP until SP2)
So this guy, with his "expert diagnosis from Staples" filed a defective item return claim - which caught me off guard because I very thoroughly test every laptop that I come across - so I contacted him to find out what was going on. After a few emails back and forth I was able to correct the issue, but by then he had "changed his mind" and wanted to send it back anyway. At the time feeBay would make the buyer foot the shipping bill if the item was being returned for reasons that didn't include a problem with the item itself, so I asked him if he'd split the return shipping cost with me 50/50 and he agreed, in writing, in the feeBay messaging system. He returned the item, I didn't get any kind of charge for the shipping label, processed his refund, relisted/sold the item to a more appropriate buyer and all seemed well. Until 6 months later.
feeBay posted the return label shipping charge to my account out of nowhere, then when I contacted their "customer service" center the rude offshore-outsourced guy I spoke to told me they would not take any action to help me, despite all the written documentation showing the shipping charges were improper because of the buyer's incorrect return type, because I "was not a top rated seller" because "I didn't sell enough items" on the platform. Nevermind the fact that I had close to a thousand transactions on the platform since I joined in 2006, and feeBay makes no money whatsoever if buyers don't patronize the marketplace.
So, after that lovely conversation I decided not only to stop selling on their platform, but completely boycott them for any goods of any kind.
Since I've never set foot in the FB domain, when I have stuff I want to sell I have to go through Craiglist or the old ThinkPads forum, both of which are slow and hit-or-miss. Overall I've been able to get rid of what I want to though. When I want to buy something I've managed by using Amazon and Mercari. Those platforms/companies aren't really an upgrade but at the very least I can hold true to myself and never give feeBay another penny.
May they bleed a slow, painful death.