>>134 (OP)
The same way vidya did. The same way any other niche hobby or interest does. When it starts, it's a collection of enthusiasts who care deeply about the subject of the hobby. Dice rolling pretend adventure, imaginary battlefields with little plastic guys, whatever it is, the people doing it do it because they enjoy it and care about it. And because the people involved care about it, they work to nurture their hobby and make it grow. Maybe it's the creation of new settings or sourcebooks, or if you're doing something competitive, tournaments. It grows and flourishes and then outsiders take notice. At first, the outsiders mock and belittle those in the hobby because they do not share the interest and do not understand the appeal. The outsiders think the hobbiests are weird - "surely someone must be a loser for enjoying something I do not," the outsiders think. Then, perhaps out of spite that they cannot destroy what they do not care for or because the hobby grows further and they see that it has influence, they decide they'd rather take control of it. "What these hobbiests like is weird and dumb, I can make it so much better. It would be better off with me in control," the outsiders think. But the hobbiest enjoy their hobby and do not want it changed. Any direct attempt to take control will be met with resistance, so the outsiders try a subtle approach. They infiltrate and feign interest. They pretend to want to learn and care about the hobby as much as the people who have been enjoying it all along. And whether out of naivete or good will, many will welcome them with open arms, eager to share the fun they have created. The outsiders then try to weasel their way into having influence, all the while framing what they want as minor changes and tweaks and just being reasonable. Some canny hobbyists will catch on, but any attempt to defend the hobby will be framed as an attack on the outsider by an unreasonable asshole. The hobbyist who resists the rape of his hobby will be framed as an asshole and the outsider will attempt to ostracize them. If the hobbyist is high profile enough, you can surely expect lies and rumors to be spread to make him into an untouchable. Outsiders will bring in more of their friends to destroy the hobby from within. The cycle will repeat until more and more hobbyists who dare question the changes to their hobby are cast out from the thing they enjoy and the outsiders cement themselves into a more secure position of influence.
Eventually you end up with shit like wheelchair accessible dungeons (in which you presumably fight dragons). Because these people despise you. They will exploit your good will or the good will of people like you to destroy everything you enjoy and care about. Because they find it funny.