It’s annoying how this type of stuff happens. These companies think they can just do whatever they want. Largely they can but when the end users say enough is enough, they change or go out of business. It’s a lot of work but maybe see if you can get in touch with other retailers on there and band together to petition them to improve their shit.

Have you tried Mercari? We have good success on there, though I don’t know if the fees are higher than places like eBay.