I doubt you could (well, with a level of effort 99.9999% of people world be willing to put in), power and the pcie connection would cause problems.

I have some issues with proton but I feel like the free tier thing doesn’t really apply to them since they provide other services and use it as a loss leader to get people onto their ecosystem. Their business model is fundamentality different from other “free” vpns because their trying to build essentially an alternative to the Google suite

Their absolutely atrocious record with what they claim to be open source apps is a much bigger issue imo