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Android will become a locked-down platform in 194 days
(keepandroidopen.org)
This is a most excellent place for technology news and articles.
In theory Canonical could lock down Ubuntu like that, but it would be the end of Ubuntu. Switching over to Mint or Debian is not a big deal for majority of the linux-users and also Ubuntu would lose all the advantages they can currently pull off from Debian package maintainers. Also I suppose it would bring a ton of headaches with licenses, but IANAL, so don't quote me on that. And, obviously, that would kill snapcraft too as I don't see any incentives for developers to support walled gardens for free, so it wouldn't be all bad.