The larger issues surround freedom of speech and the protections that online service providers have. I would have expected this kind of thing to happen after FOSTA was officially signed into law, which hasn't happened yet. Apparently Michael Lacey, a cofounder of Backpage, has been criminally charged [1]. I don't know all the issues involved, but overall it's a scary day if you own a website that has anything to do with personal ads.
[1] https://www.azcentral.com/story/news/local/arizona-investiga...