I hate Tik Tok with a fiery passion. I think it is stupid and bad for the world. I have also been trying to block it for a while, unsuccessfully. Until now that is. I set up a PiHole, I already had it but basically did not use it, and actually began using it. Rather than block Ads and such though, I just block the domains for Tik Tok. I did this by going to Tik Tok over and over again, then blacklisting every domain I could till it completely broke the site and the app.