Not a very bright idea
They have a very serious issue with PayPal refusing payments to their performers (sex-workers, in plain terms), and their actions are directed toward resolving this issue by any means available. Creating their own coin would only make things worse by shifting focus from a real problem they have right now
How is it supposed to help Pornhub exactly? Are they going to pay their models with it if the latter need cash for their livelihood? As far as crypto is concerned, they better stick with a time-tested option, and that is Bitcoin beyond any doubt and any second thought