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PSA: Lemmy votes can be manipulated
(feddit.nl)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
I would think that they need to set a somewhat permissive threshold to avoid too many false positives due to people sharing a network. For example, a professor may share a reddit post in a class with 600 students with their laptops connected to the same WiFi. Or several people sharing an airport's WiFi could be looking at /r/all and upvoting the top posts.
I think 8 accounts liking the same post every few days wouldn't be enough to trigger an alarm. But maybe it is, I haven't tried this.