Hi guys!
In short:
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Yes, if you use PureOS+Tor; no, not compromised, please have a look at: https://puri.sm/forums/topic/what-about-code-running-on-hardware-inside-the-computer/
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Not yet, but it will be soon (from webshop on our website)
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October is most likely date for Librem 15: https://puri.sm/posts/4k-at-last-purism-librem-15-rev2-4k/ (at the moment I can’t speak for the Librem 11, will update soon)
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PureOS is pretty much a standard linux distribution (Debian) which provides only free and opensource software (which should be enough if you use Tor and follow basic security practices like https://www.linode.com/docs/security/linux-security-basics or https://devops.profitbricks.com/tutorials/linux-security-best-practices-1/), for QubeOS please have a look at: https://www.qubes-os.org/tour/ (QubeOS )