What is the line you draw between a service dedicated to enabling affairs, and a service dedicated to enabling, say, emotional spousal abuse? Or physical spous

What is the line you draw between a service dedicated to enabling affairs, and a service dedicated to enabling, say, emotional spousal abuse? Or physical spousal abuse? Because, those people chose that path for themselves and their partners chose the path to be with someone who made those choices, right? I'm pretty libertarian. I'll basically stand by the right of anyone to do something that makes themselves desperately unhappy because they're adults and can make their own choices. I don't think it should be illegal to cheat on your spouse, and if people want to marry people who are clearly making them unhappy -- even hurting them -- then the most I'll do is strongly suggest they reconsider their choices. But it's a whole different matter to set up a service dedicated to profiting from enabling behavior that's making other people miserable. That's shitty. It shouldn't be illegal, its users should still have privacy, but I'll shed no tears if the proprietors of said service get forced to shut it down.