It might be more like users are consolidating.

For the past few years, one of the only ways for most people to join different parts of the fediverse was to create multiple accounts for multiple instances. I had to do that over the past couple of years in order to join whatever instance using whatever platform that I happened to be on. On top of that, at the start, I wasn’t sure what the platform I was on was like or whether or not I wanted to stay with it, so I created a burner account. So when I started heavily using the fediverse two or three years ago, I had a ton of accounts, most of which were just short lived accounts because I didn’t know I wanted to stay with any one instance or platform.

Mbin … Kbin … was a famous example … it started out as a promising alternative to a reddit like system and I started a couple of accounts there, only for the whole thing to die off and become Kbin … Mbin … [EDIT: I got Kbin and Mbin mixed up - thanks @Blaze@piefed.zip ]

So for the longest time, I’ve always been cautious and just started temporary or burner accounts everywhere because I wasn’t sure it would last. Now everything is maturing and I’m feeling more and more confident every day and now I spend almost all my time on the fediverse. Which means I’m using fewer accounts and the accounts I’m using are becoming permanent