As open source started booming, more people joined. Opinionated people. People who listened to the "we welcome everyone!" message and felt that their opinion could be their primary contribution. For some, they felt showing up at the gig gave them the right to dictate what the band played.
From a leadership perspective, this was a tough spot to be in. On one hand, you want to foster an open, welcoming, and empowered community. You want that diversity of skills, but you also want value and quality. Low-quality contributors don't bring much other than noise: they are a net drain on resources because other good contributors have to take time away to support them.