Are you hosting it through a provider such as AWS or Azure? That might be why. I had no issues when setting it up on my own.

I have 2x ISPS and through that multiple raspberry pis. Set up docker, then you can set up multiple VPNs (e.g. OpenVPN which I used just before pandemic) so after 2017. It always worked but these days I would also esim it - they can't block roaming mobile due to the way roaming works and the travel Sim prices are quite competitive these days.

Tldr no issues hosting on personal internet rather than through a cloud provider.

Example ones I use, simple to set up via docker files.

https://hub.docker.com/r/linuxserver/openvpn-as https://hub.docker.com/r/linuxserver/wireguard