Honestly, in this day and age I consider VPN a basic internet hygiene. There are many many reasons to not trust your ISP and the wire between your home and ISP. You have moderation here, why do you even need to block VPN? I registered this account from VPN, but I somehow cannot comment from VPN? Doesn’t make much sense. I’m using paid Proton VPN servers, and btw I’ve seen Proton having a dedicated community here on this platform.
IIRC the decision was to ban certain VPN IPs based on a csam attack last year (-ish), and it was the easiest decision they could make. And since they are all volunteers (and they are the admins), there is no telling them different.
It is what it is. ¯\_(ツ)_/¯