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I usually ignore that kind of thing. If it’s excessive (5+ communities) and the user does it habitually, I consider blocking.
Some frontends, like PieFed’s, are smart enough to collapse crossposts into one entry, showing only the post with the most engagement.
And if the one with the most engagement has 100 posts, and the second one has 76 posts, what happens?
I don’t know the details of how PieFed does it, but there is a button underneath whichever post is considered the ‘main’ one where you can view the details of other crossposts and visit them if you like.