It doesn't seem that abusive. I don't comment things out thinking "this will keep robots from reading this".
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EDIT: I was chastised, here's the original text of my comment: Did you read the article or just the title? They aren't claiming it's abusive. They're saying it's a viable signal to detect and ban bots.
> A few of these came from user-agents that were obviously malicious:
(I love the idea that they consider any python or go request to be a malicious scraper...)