I’m not sure your few weeks experience is all one might need to understand the platform. But to humor you, the entire premise of the federation of servers is that each server has block lists of servers they have defederated, not to mention the ability of users to block and mute people and even entire instances. In addition users can choose to filter out keywords and hashtags so that they never see them, or anything with a CW.

Plenty of servers wholesale blocked instances preferred by journalists because they didn’t want any news or politics infecting their feeds. This has all been well-documented. Do a little more research outside of your own limited experience.