I tried to use mulvad, specifically as a blanket VPN on a router. Here is what I found:
1. Not great for streaming services. They just know you're on VPN and block you. You must whitelist a bunch of URLs, some which seem unrelated which tends to defeat the purpose.
2. Not sure why, but my internet was SLOOW. I was configured to connect to a local server but the speed was less than a 10th of the original speed.
It would be good to understand how people use their VPNs, if not blanket, then how and if blanket, then what services do you give up?