It originated on /b/ over a decade ago, as usual, communities treading on incelcore harbor such things
As per the benefits I can only account what I've experienced, so: on the lowest point of my life, during the pandemic; I was yearning for a glimpse of control in my life since everything around me was falling apart, I decided to take on abstaining from masturbation for a while, one or two months, I wasn't counting the days or anything but I did stop jerking off thinking it would bring me some clarity, now, anecdotically of course, I didn't feel any positive change whatsoever
Porn can be extremely disrupting, addictive, destructive, it can also be inconsequential, I think the problem lays mostly in the blurring of reality and the lack of consciousness around it, I would advise against leaping into the parallel reality that porn offers, but the damage can be done also by video games, indulging in food, sex addiction, balance truly is the key of everything in my opinion
Not jerking off achieved nothing to me but honestly a couple light fuckups here and there from poor decisions with girls because I lacked the post-nut clarity of doing something like sending flowers to a girl who's not into you just in the hope of her liking you, sincerely just cum and then see if what you're thinking of doing is benefitial to you, but I put the movement's ideals into practice and I don't believe the mantras now, thankfully it does bring forth a sense of community for people who need it
If you've got people who band around collecting stamps I don't think it's a stretch to have people connect through their lack of jerking off, more power to them, and the preaching of its benefits is just another recruiting tactic to invite to their communities, as long as there's no harm that's fine in my opinion.