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Spamming can be found by metadata and reports. There is no "this site is absolute crap" button for them to find useful feedback in searches.

They've had 20+ years to add one.

Add? They have one. Click on the three dots next to the URL then "Feedback" -> "Something else" -> "Spammy content".

Something like this has existed as long as I can remember. The three dots used to be a down arrow in the same place.

Even better then.