Yes, that is true.
Pornhub accepts cryptocurrency.
I think it will a good start for the porn industry too, and if there are other similar websites which can be accepted cryptocurrency, then it will help the growth of cryptocurrency on the internet.
More people will see a new payment system available, so they don't have to use a credit card to pay or subscribe to those sites.
As long as there are more websites can integrate their system into cryptocurrency, and they can add a cryptocurrency payment button in the product sale page on their website, people will see and will curious about cryptocurrency.
But the big important things that will help cryptocurrency to boost the existence and the growth of cryptocurrency is by approving from the government so the cryptocurrency can grow fast in under the government regulations.
But that will not easy as many countries still not approve cryptocurrency as a new payment system.