Hello Scott,
the free VPN arrived yesterday, so I just made a quick test on a small number of the countries, to make an answer.
Thank you for the link, it was interesting.
I know only the info on Proton site it says this -
"As a Swiss VPN provider, we do not log user activity or share data with third parties."
"Unlike other free VPNs, there are no catches. We don't serve ads or secretly sell your browsing history. ProtonVPN Free is subsidized by ProtonVPN paid users."
It has said similar on other VPN sites like the one in the link.
I use TOR rarely, and will also use VPN rarely, I use only to bypass ISP blocks for sites they say have copyright infringement materials, it can be a mistake of over working filters very often, but sometimes it is correct, I might want to watch a documentary I missed on tv. I use the BBC iplayer for BBC ones I missed because my brother pays a licence and it means we can all legally watch tv, or use the iplayer with login. The other stations covered by the licence, I don't have a login, I had one for 2 of them, but they send too much spam, so I deleted them.
I only watch on the TV maybe 1 times per week, or sometimes 1 times per month, or even less often.
I think if I was to try hide internet use I would maybe get a screen for the Rpi to use mobile, or a used laptop, (coz it seems similar prices), and find out a way to use a public wifi without going inside any place. Or scan and use a many proxies together, but it would be safer maybe to not be in a fixed place and use the public wifi.
I realize if the computer is connected to the outside world, or can be connected any way, then it can never be secure. Only more secure than less secure, but not secure etc.