2. Yeah its may be unhealthy but people do all kinds of unhealthy things to themselves.
3. 35k subs on a subreddit that seen around 12 years is TINY. There's a sub about quitting porn that has over a million.
4. Even though you claim there are "no studies", here's a study from the WHO. Where they concluded that no action beyond "monitoring" was warranted based on current evidence.
https://www.who.int/publications/m/item/kratom-mitragynine-7...