The fact that OnlyFans isn't even trying to move to crypto to keep their business alive is a stunning indictment of the state of crypto as a viable payment method.
What are those last 10% worth to you? Unless it's still the difference between personal financial independence and wage slavery for the majority owner, I can't see how that's the rational choice. That's why I'm concluding lack of imagination and borderline incompetency.
Of all companies that could adopt mass crypto this one would be somewhere at the bottom of the list imho.
The percentage of consumers with crypto is maybe 1%. The percentage with credit cards is maybe 90%. If OnlyFans moves to crypto, they cut their addressable market by 98%.