That's the most likely reason IMO. For all the left's SJW talk, they still love porn. This move doesn't align with woke. Pornhub is probably one of the most likely uses for a stolen credit card numbers. CC companies are probably losing money with pornhub for fraud chargebacks. I doubt blocking that site will change the end result. The stolen cc will probably get used on onlyfans or whatever the next most popular porn site is.