The problem with the fediverse in that regard is that it’s basically multicasted. On one hand that’s a negative for the reasons you’ve said, but on the other hand it means you can easily dig up information that moderators and admins acting in bad faith can hide and then claim whatever bullshit they want.

Ultimately, you really shouldn’t be seeking privacy in lemmy and should try to refrain from using information that can personally identify you if you are really afraid or really incapable of having a public presence. If someone tries to dox you, they could dox you from any website. If they do, the way to proceed with that is usually filling out a police complaint form and/or any other specialized agency in your country block that can deal with it, or if you have the money, to get in contact with a lawyer which usually makes it about who has the biggest bank.

However, we also have to understand what is being called doxing. In your case, I understand its someone pointing out an alt that had apparently posted content word for word. Doxing generally involves things like the SWAT showing up and assaulting your home or people messing up your personal life by making personal data public for misuse. I’m not sure how noting similarities to try to imply that you should also be banned applies here.

And trust me, I’m in a very similar situation, except it involves an admin committing libel just because I complained about them where people who complain about them also have, ergo I must be whatever the worst shit that he can throw at me and get to stick is, which apparently has been that I’m an alt of an account who is a pedophile on another server. Not only that, they didn’t even mind including and leaving several links to an external server spread out through several comments that they claim hosts the pedophilia with the implication that people go there and check it out for themselves to confirm an association to the person they were accusing. Implied because, well, they are just leaving the link there without any real explanation, which might mean a user on a “No porn” instance could also randomly click on it if they are careless.

Going after libel is pretty shit, you can’t really do anything about it, but I have reported the links to what is by their own words pedophilia to the appropriate organizations because that’s far more serious and I’m sure not going to sort through that shit. But would I call it doxing? Well, besides the fact that the claim is false, no, sometimes libel is just libel, and sometimes linking to CSAM for any reason is still linking to CSAM. Looking at this, some lawyers do claim it is when it is tracking multiple usernames, although I imagine it might involve associating accounts with personal identifying information.

Doing it isn’t necessarily wrong but should be limited to gathering information to report to law enforcement agencies to help with their investigations, if it’s something more than casual speculation. In communities where the community itself can be considered an extension of the authority, the issue limited to it, where transparency is valued, and where the information itself isn’t really that personally identifying, well, the circumstances seem different. Frankly, I think an abuse of authority is worse than doxing in such an environment, specially in a social network where you control the flow of communication. If that’s your case, you should probably be calling that out instead.