Yeah, I get that.

I'm just pointing out that there are ways to do that without sacrificing privacy (by using one's real name for example). The way I've personally settled on is through the use of persistent pseudonyms. And that a person might use more than one of those.

Dismissing such behavior (using more than one username to access a site/platform) as “hiding from accountability,” just seems unfair to me.

If there is abuse, impersonation, or whatever wrongdoing committed then let it be dealt with by the mods and admins with the powers they have.

Furthermore, you are free to branch out Lemmy source code, implement the features you think are needed (say, restricting one IP to one username and vice versa), and fire up your own instance using that fork. And if there are many others who share your view on things, then not only you could find others to code the features, you also could find people willing to share admin and other front-facing work with you.