its not a bubble its what happens when a platforms users are free-er to set the bar on what is and isn't acceptable, without intervention by the interests of the platform owners and it turns out, the users overwhelmingly don't want shit tier people on here
The VergeBluesky's new CEO Toni Schneider on the platform's reputation for being a liberal bubble: "Yes, we definitely want that to change. It is already changing. It certainly wasn’t designed to attract one specific group of people."