They knew (rightly so) that if they opened an OF account, they would get a bunch of free press and bring more eyeballs to their artwork.
> Mr. Kettner said that the OnlyFans account is not a permanent solution, but rather a protest against censorship and a call for conversation. “We want to draw attention to a certain thing,” he said. “We want to put it out there, to talk about the role of artificial intelligence, of algorithms.”
https://www.nytimes.com/2021/10/21/style/onlyfans-nude-art-v...