You should speak to them and ask for the terms and conditions that they claim were violated. They have no issue participating in sales of computer hardware, so they should be fine with your business. You may have to update your website to downplay mining and/or also mention use for more generic computing tasks.  Another option to consider is opening an eBay, Newegg or Amazon store. You would have to increase costs a bit to offset the fees, but it could greatly expand your customer base. Lastly, you could consider wholesaling to one or more stores.