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Signal warns it would pull out of Canada if made to comply with lawful access bill
(www.theglobeandmail.com)
This is a most excellent place for technology news and articles.
Pulling out is super easy. Just don't release a compromised version of the app. Done.
If the app in its current form doesn't comply with Canadian law, then the play store can't legally distribute it. So, problem solved.
So basically Signal can pull out of Canada by doing nothing different than they're already doing.
As for the users who already have the app installed, well that's just too bad for Canada isn't it.