Well, sex work is work probably mean about real people working in the sex profession. People can just cancel their credit card and look for different payment processes too.
I just cancelled one of my Mastercard cards last week and think about use one from a different company. At least here in Brasil exist others but people can just use other methods of payment too.
I found developer that just move his Novel to a adult focused website. But his story have a lot of sexual visual content.
The creator of Echoes from Valeth https://aucyonproject.itch.io/echoes-from-valeth.
... Look like need pay to download it there ... or just the option to choose.