Pretty dumb move in some ways tbh. WeChat is used by a lot of folks in the business community to sell goods to Chinese customers.

As for TikTok - I read an article that claimed they have some suspicious spyware-like features but I suspect it's no worse than Google or Facebook. Also from what I understand these may be for crash dumps / optimization reasons. I guess you'd have to trust the folks collecting it to not do nefarious things with it, so there's that.