Do android handset makers do these notifications? I mean - it's very likely that a LOT of chinese apps in particular (which these were) may have security holes,

Do android handset makers do these notifications? I mean - it's very likely that a LOT of chinese apps in particular (which these were) may have security holes, including ones that are there for govt purposes. Did the directly affected companies do the notifications? I thought Apple had sort of a separate setup in china (data center etc) to mitigate some of the issues there impacting the rest of their user base.