Some free online banks do offer free unlimited ATM withdrawals. They then proceed to boot out anyone who does too many ATM transactions. This way they get rid of the costly customers and they can still market that their ATM withdrawals are free.
I would be very concerned if Revolut were offering an unlimited (or even very high) free ATM withdraw limit.
Number26 bank for example, recently kicked an enormous number of customers out for this exact reason. I’d much rather pay a fee than risk getting kicked off the service.