I haven't tried Mastadon, but I get your point. But I'm sure people would be confused about the instances and stuff. When you really want to try it out, then you typically have patience and see how things work. A lot of people just simply don't care enough to try this when there was no issue with Reddit for them in the first place. I am trying to shift because I'm annoyed at Reddit, but someone who isn't really has no reason to.