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It's not an abuse to post on multiple platforms unless someone is copying and pasting content into Hive.

I would inform communities on Hive that curate this user about the fact that this is a known user on Steemit.

By the way, you promote Steemit yourself.
https://hive.blog/newcomer/@univ88/gameweek-24-top-50-done-next-target-top-30