Coinbase was always a crappy company, and there is probably no end to the scams they pull, but this one is really bad, especially when they’ve included conditions in their user agreement to steal from customers. I tried them out many years ago purchasing just a little Bitcoin, and I found their fees entirely too high. I’d speculate they do a lot of crypto mining to cover overselling their crypto supply too, playing paper games to enrich themselves further being firmly under the control of the bankers while following their playbook.