> Why hasn't crypto made inroads into this world yet?
Why do you assume it hasn't? If I try to purchase premium on PornHub[1], it ONLY shows cryptocurrency as an option, and says: "Unfortunately we are unable to accept credit cards at this moment"
(Maybe in other regions it's different)
And I'm sure almost all porn websites accept crypto.
Also 4chan pass[2], can ONLY be purchased with crypto as well.
[1] Not linked in case it violates HN guidelines