Many of those in the past were just scams and uses the term mining to get people invested onto them. While some have existed genuinely but for bitcoin, the profitability isn't a lot.
i
TOTALLY AGREE it is somehow the case, and to be honest with you i had the opportunity to try it ; I mean before the TOS against mining in numerous plateforms....
The profit was possible during the age of free trial offers in numerous plateforms .
Right now it s more a waste and there are musch better opportunities that are worth it . + Against TOS .