The increasing follow-concentration is a direct result of their trending list and their preset follow-list for newbies. This was immediately obvious, from the get-go, but they have just left it like that.
Also, whilst the majority of the other devs and relay-managers immediately jumped on the ReplyGuy issue, Primal was lackadaisical. They are often AWOL, and they don't seem to use the relay, web client, or image server, themselves, on a daily basis, so they let the systems atrophy, and fill up with literal garbage, while performance crawls to a halt.
The other devs are eventually annoyed by their own stuff being broken, since they use it regularly themselves, but Primal devs are like vegan butchers. They can legit watch their repos rot for half a year and not give a damn. I've seen a lot, but that takes the cake.
Primal got way too much funding and way too much adoring press, from the get-go. They're front-and-center at the conferences, of course, talking a big game. They be like
https://media.tenor.com/GAPSxsTdaiwAAAAC/valentino-rossi-rossi.gif