No luck with ProtonVPN free account and Netherlands servers.

Proton is the worst I've seen, it has bad routing. For example, on a Macbook, if you are connected to Proton and set up a VPN with your server, the traffic bypasses Proton. I checked on my server and saw my private IP, which is not observed with PIA (private internet access).

DeletedUser115 hmmm. Thats definitely my bad. It doesnt seem possible. I thought I had set it up like that on a little used profile I have for a specific purpose but in fact I used OpenVPN Connect. I was conflating that with setting up a free proton account using the in built VPN functionality of a windows 10 machine but even the instructions for that seem to have disappeared from Protons website. Sorry for the bad info all.

      What is the definition of "built-in VPN client" ? IPSec? Isn't it the only one running in kernel mode? Maybe that is why it is not affected. It could be a race condition between OS and user space VPN apps.