I do at least compare prices and availability on ebay now. And did just delete my Goodreads account (which they nominally own) after getting followed by a fake “adult” site/bot.
eBay/PayPal is just as bad as Amazon.
I bought something recently on eBay, and it turned out it was just an Amazon drop shipper. After a week, I inquired as to why it hadn't been shipped, and as if by magic, it was shipped that day and arrived the next day in an Amazon box.
Amazon tentacles are everywhere.