Something I noticed a few years back. If you click just ONE post/video/reel/advert that is even remotely related to ADHD on any platform with an algorithmic feed, where you have previously never clicked before... It will feed you content implying that that particular neurodivergence both applies to you and is the source of all your problems, for MONTHS, even if you never click another one.
The only other thing I've seen that behaves this way in the algorithm is far right-wing clickbait. Everything else just disappears after a few days if the algorithm detects you've lost interest.