@Yuriii4
If someone tries to blackmail you, the best thing you can do is call them a pussy and then say "Do it bitch. Don't be a pussy. Don't puss out on me. Do it bitch. I'm an open book. Anything you have, my friends and family already know. You got my nudes? They're already on my public facing blog. I use to be a stripper and everyone knows it. I'm the most valued asset at work. You think they give a fuck? I'm a motherfucking legend. I do more with my life in one day than you do in a year, so fucking do it. Don't be a little bitch. You make a threat, you follow through, or you're just a pussy little bitch".
As for their accounts re-joining every time you block them, you can use IMVU Lite's mute button to shadow ban them. If you mute them, their messages no longer show in chat and their avatar / products are no longer visible on your end. That makes it impossible for them to black out the room or crash you. On their end, everything looks normal, so they don't even know you muted them.