[proof_by_vibes]

Perfectly safe. I would argue that it is the safest of the three, the least invasive both in terms of its design and in terms of privacy.

The open source model of development has encouraged the correct incentives for people to become active in identifying and fixing possible exploits in a global, communal effort.

Every server on the cloud has (by a large margin) chosen Linux as the OS to trust specifically for this reason.

[GeorgeOldfield]

for most people linux is the least secure. linux assumes the user knows what they are doing, whereas windows and mac os assume the user needs protection.