An inactive account is just an entry in a database. The impact on the server is negligible.
So you, as an individual manually doing things, aren't going to DOS a server. If a huge amount of people did the same thing heavily, maybe (this was what the old "hug of death" from Reddit was; too many real users visited sites not used to that traffic). Probably don't make a bunch of hyper active bots without awareness of the resource drain, especially on a smaller server, but good faith use shouldn't be a major issue.
Realistically an account with a small handful of posts won't either. A server is already mirroring a bunch of other instances and communities and one account with minimal activity just doesn't take many resources.
You can delete the accounts if you want to clean up, but inactive accounts doesn't affect the server nearly at all.
It's probably good for all of us to sometimes switch accounts, because the idea here is to be semi anonymous. This is also why I'm against everything that will centralize Lemmy.
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