I think doctors are diagnosing ADHD more often because it didn't used to be a recognized thing. Awareness and detection are both rising. I also think as pharmaceutical companies make ADHD meds they can profit from, it is yet another incentive for doctors to give an ADHD diagnosis.
I think people are self-diagnosing ADHD more often because, well, I could probably write an essay opining on that. It's not just tiktok because the self-diagnosis trend predates tiktok but tiktok certainly contributes.
Excessive time on TikTok is not good for a person, whether it "causes" ADHD or not.
If you have an ADHD diagnosis, have a conversation with your doctor about both meds and non-med ways to improve your life. Cutting down on TikTok may be advisable, in addition to any meds or other instructions the doctor has given you. Obligatory "Lemmy is not the place for medical advice".
Unless it is a dating platform for tech savvy gay/bi men specifically, it would also have to solve the problem of even lower numbers of women who are users. Even non-fed dating platforms struggle to reach a 10:1, men:women ratio of active, non-bot users.
As a woman (just have to phrase it that way), good luck to any who try. Personally, I can't think of anything that would entice me to sign up for a federated dating platform.