Terrible. Someone in the comments is speculating that this is due to TikTok trying to prefetch contacts' profile pictures in case there's an email address in the clipboard that will be used soon. I don't know if that's true or not, but I really hate this pattern (Zoom is one of the worst offenders) of "completely destroy all concept of security and privacy and a functional operating system for the tiniest of microsecond-level conveniences". It's straight-up evil.