No point in attacking you for something that works for you. Neither of us learns anything under those conditions. Philosophies teaching abstinence in physical pleasures have been around forever. In my mental map of the world, the NoFap community falls under those.
It is something you believe helps you be the person you want to be, more power to you. I would only consider it harmful if it attempts to impose its ideas on people who don't agree. Or deliberately spreads misinformation internally that may be harmful to its adherents.