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Keeping a list of "fingerprints" of users is hardly invasive, and it's only dangerous without proper database security.
It can throw up false positives, but the key there is to make it as good at not doing that as possible, and having a reasonable means for users who feel like they were unfairly tagged as evaders to appeal the flag.
Also, don't do it automatically, use it as a tool to identify possible cases and have a review team check for which ones need the most immediate action, with help from a separate algorithm that prioritizes user reports by how reliably a users' reports have pinged actionable content.
That's the entire game of security, not being perfect, but being good enough for the adversary to decide you might as well be perfect for all their efforts would be worth, and ban evasion protection and bot prevention are no different.
Yes and good enough is so hard to reach that this is no way accomplished with Lemmys volunteer resources. We literally have full time people and massive AI driven systems doing this professionally. This is no way achievable in Lemmy if centralized Reddit with multi-million dollar budgets can't even get close to "good enough".
TBF Reddit isn't exactly trying all that hard since ban evaders tend to be good for engagement metrics. Like half the measures they do employ they only do because they feel like they have to in order to not look like they just blatantly don't give a shit so long as the investor watched metrics keep going up.