we should ask ourselves why on earth we allow javascript and similar technologiesto actually run code able to snoop on cache memory in the first place.
A few years ago I would have been indifferent to this - subject to the usual security provisions of course.
But now, seeing the stuff that runs on android, most of it - even from "reputable" companies is basically spyware, and so blatant they don't give a shit about it.
With my programmers hat on, I have no sympathy for those complaining about GDPR etc. - they brought it on themselves.