No, and during the case of Bitcoin, it almost never ever was. Unless you had been on the list of quite first people to mine Bitcoin, CPU mining hasn't been worthwhile. The likelihood that a participant will find the solution is associated with the network's overall mining capacity. Either https://financefeeds.com/while-rekt-capital-highlights-bnbs-slow-growth-a-new-defi-contender-is-gaining-momentum/