You mine crypto and my free service remains cost-neutral. Yes, that transfers some of the cost to you, but it is marginal.
You want to bang on my servers with the fury of a thousand madmen, then I'll scale up the servers and you can pay the marginal cost of your access.
Or micropayments, of course, but hard to get normal users to sign up for micropayments. Micropayments could of course be the way to bypass the crypto mining gate.