From a quick google search; "btcprominer, fastminer, btcminer, euminer and similar are all from same scam. Same script, same scam"
There aren't really get-rich-quick methods in life without a lot of luck on your end. If you're looking to get into crypto, just buy some yourself (it's down quite a bit, I'd get some asap). If you're trying to mine, you'll have to invest some money into getting the proper equipment. These sites feed off desperate users looking for a quick buck, and I imagine they work (for the owners, not you).