It's just openvpn. If you dislike their app,use vanilla openvpn!
As far as instability..yeah it's unstable on the free version because you only get to access highly saturated free access servers.
With the paid plan on proton I see disconnects every othet day or so (random servers).
I use the free tier as well but I have it automated to where I force a reconnect if destinations are unreachable.
I believe proton uses Nord's infrastructure to some capacity?
But yeah,not fair at all to compare a free plan with a paid one. Even if they charge 1€/mo,those users are supporting the servers they use. With free,it's unlimited number of users that saturate a free server so you should expect less quality.
As far as instability..yeah it's unstable on the free version because you only get to access highly saturated free access servers.
With the paid plan on proton I see disconnects every othet day or so (random servers).
I use the free tier as well but I have it automated to where I force a reconnect if destinations are unreachable.
I believe proton uses Nord's infrastructure to some capacity?
But yeah,not fair at all to compare a free plan with a paid one. Even if they charge 1€/mo,those users are supporting the servers they use. With free,it's unlimited number of users that saturate a free server so you should expect less quality.