In all seriousness, TikTok's Gen-Z userbase played a big role in a huge embarrassment for Trump recently, and given that there seems no end to his personal vanity and vindictiveness, I would not be surprised if this decision was rooted at least in part in vengeance against its users.
Why would any candidate seek "vengeance" in an election year toward a cohort who will be voting for the first time (in many cases) in 2020 and who seem overall more conservative than the previous generation? It seems way more likely to me that the jester is cover for or distraction from something much more serious, and I'd rather talk about that than feed the jester's personal vanity by interpreting every major world event through orange-colored glasses :)
See: https://www.nytimes.com/2020/06/21/style/tiktok-trump-rally-...