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Or more simple still, it's a hard problem to solve and when there's billions of emails flowing through the pipeline every hour small mistakes can look big to individual users.

Same as with gaming search, it’s possible that spammers are catching up with the Google smarts, and from this point it’s unclear how to proceed.

"Never attribute to malice that which is adequately explained by stupidity", except for the "promotions tab", that was clear malice to increase their ads revenue.

I don't think they're bad, it feels more like they hit the 80/20 point and move on to something else. In the case of spam detection, whatever worked ten years ago set and forget without anyone quality assuring it as things evolve.