Why is .ooo a bad TLD?

SpamAssassin’s SUSP_NTLD includes .ooo. However, the new registration price for this top-level domain is not that cheap. Why has this domain become a hotbed for spammers even though it is not inexpensive? Why is it included in Suspicious TLDs?

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Highly likely historically it got dirt cheap 1st year registration price, hit and run spammer swarmed it, it got listed on spamhaus and are now forever tainted.

tld-list.com used to have chart listing pricing history for all tld but its now gone after site change so i can’t check. I usually avoided weird newgen gtld for exactly that reason. The old popular gtld .com .net .org and popular cctld are safer bet for email usage than those weird newgen gtld.

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So that is the historical background. I learned a lot.
I am curious about the changes in the historical lowest prices. I hope there are other services where I can check this…