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This is very very bad. People follow that trail because they trust curangel, and in the end they abuse their own downvotes without even knowing it...

Should I unfollow curangel? I think they curated my 1st post.

No, don't unfollow them. I hope the main curator will be aware of possible biases, I mentioned it to him...
Maybe do not join their curation trail if you do not want your downvote to be used without you knowing it.