And on a related note, the ability to browse forums with vastly different themes, cultures, and tolerance has always been there. The big networks solve a discoverability problem for end users (and get accused of being the problem when they [don't] stop certain things being discoverable). Moderation complaints have revolved around the platform companies promoting or refusing to promote stuff to their widest possible audience even though other websites exist, and I don't see how the biggest 'filter' providers don't run into the same issue (with the existence of niche and manually customisable 'filters' failing to be a 'solution' in the same sense many people are unhappy with being able to reach Gab followers but not Twitter ones)