I'm going to sub-skeet this because I don't have the strength or inclination to get into it with...strangers.
Copying is part of the creative process. Many creatives start by emulating their influences. You grow out of it.
Fanfic can be a part of that, or its own thing, or both.
Lighten up.
I have never understood how ppl have the bandwidth to get this worked up about what someone else does in their free time by themselves for their own entertainment that is hurting nobody
My monster-in-law has made this a foundational part of her personality. Like, yes, that house's exterior decor isn't to your taste, we get that, but it's not even in your NEIGHBORHOOD and you aren't forced to look at it, so maybe stop ranting about it. Get a fucking hobby.