First of all of there are others with regrets they are most likely also found there. Second to warn others. Thirdly to vent.
I don't find that the least bit credible. The proposition forum administrators would tolerate someone "warning others" against the core uniting aspect of their community is not realistic. Generally anyone who questions orthodoxy in such niche communities face vitriol and get banned quickly. Apostates do not hang around religious conversion forums talking about deconversion, gender transition desisters are not welcome on transgender support forums etc.