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User data stolen from genetic testing giant 23andMe is now for sale on the dark web
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Preventing these kinds of attacks is a nontrivial problem space and is the exact reason why scraping services are a lucrative business.
It is not trivial to prevent dark web actors from using botnets to make requests and it is comparatively inexpensive to access botnets as a service.
Sending emails for suspicious login is 2fa, by the way.
If you think that IP blocking stops credential stuffing you really are out of your depth.
Would it stop this guy if he was some skid just running Kali? Absolutely.
But it ain't going to stop anyone more determined. Especially since you're going to let those blocks expire to avoid blocking legitimate customers. A patient opposition with minimal resources will get by that kind of naive approach.
Not only that but you have 0 evidence they didn't IP block. They absolutely could have standard protocols in place but anything short of 2fa is inherently vulnerable.
I think what he was trying to say, implementing those strategies would deter 90% of rookies (using kali toolkit as a service), but not the 10% who got the right technical knowledge and enough motivation to clamp down on what they want.