I could understand if stripe was worried about regulations or KYC, but they already do (imo) way more frisky crypto implementations like powering exchanges fiat to crypto. ( see https://stripe.com/use-cases/crypto )
Why not let my users pay in crypto all through the existing stripe interface? Do I really have to go build ANOTHER implementation for bitpay? (Already had to do one for paypal). Stripe is becoming less and less of the "payments for developers" and more and more of the "godaddy walled garden" every year.
There are only downsides with crypto and that is incredibly risky for Stripe as they don't want to be a facilitator of scams, NSFW payments, ransomware and other illicit activity that crypto is associated with.
It is simply not worth the risk.