It should be noted that the cams see a lot lower chargebacks than subscriptions because of the shady tactics a lot of subscription adult sites use. Example would be not noticing a "$1 trial" addon being offered that recurs at like $44.95/month.
The rest of the chargebacks can be offset with 3DS/3DS 2 to shift the liability off the merchant (In this case OnlyFans) and onto the issuing bank.
I can answer any questions within reason if someone wanted to know anything more.
Source: Worked/wrote code for a high risk payment processor with volume +$1B/Yr.
Disclaimer: Opinions expressed are solely my own and only my own.