Echo chambers are what happens often when you trust personalized algorithms. You pick specifically the things you agrree with, and then later you don't get exposed to things beyond your own worldview and interests. And recently, algorithms have been proliferating all over the internet and there's a lot of discouragement from using smaller services - a lot of it has to do with how the variety of content on the bigger social media networks is not yet replicated on smaller sites. The fact that smaller sites have now become usable thanks to Reddit and Twitter going down the drain makes me feel like on one hand I feel more free now because I can explore all sorts of sites and more people will be there, but on the other hand I am intimidated by the sheer amount of alternatives and my mind can't manage with all of them at once, so I minimize my general social media usage. The fediverse is, in a way, consisting of "novel unique websites coded manually by hobbyists running servers for free".