Finding a malicious reason for something is never difficult.

I have an alt for my more less artistically expressive alter main ego. I just want to keep it separate from this general doomscroller account. (I could not have demonstrated the single biggest downside so well if i had tried)

One more as a backup for that alt when the smaller instance has technical issues.

One more on that big instance which i never liked but was accepting new registrations when my original main instance went down.

One more on my own instance which is still in experimental level.