https://news.ycombinator.com/item?id=24818024https://support.google.com/mail/answer/10173182
It's on (and can't be disabled) if you have the Advanced Protection Program enabled.
Started around three months ago.
Hilariously, they warn you when doing the Takeout export that because you have APP enabled, your export may take weeks or even months to be generated.
https://s.sneak.berlin/@sneak/105599881937545540