Is this true for self-operated VPNs? I run an openVPN instance on an old laptop in my apartment that also handles a pi hole instance and a minecraft server -- I'd think that any "VPN blocking" could apply to VPNs as a service, but not a VPN that I rolled and hosted myself.
You never get captchas and other annoying "security" measures when using openvpn? I get them all the time, but I assume that it's because the IP addresses are from mullvad and not as trusted as your ISP. What you have is a good setup for working in various untrusted environments but it's not the same for those people who do torrenting or say skipping past oppressive governments where they're trying to be anonymous via VPN.
I'm self-hosting a VPN server on Digital Ocean, and whenever I'm using it, some websites notice that my IP address belongs to a hosting provider, so I start to get lots of CAPTCHAs. So yes, at least Google and Cloudflare detect that.