Where you put your mouse 
Usual use case is just privacy or sometimes getting around region-locked content. I personally have very sadly switched away from Mullvad as well due to the lack of port-forwarding. My ISP does not allow it and I use it to play certain games with friends (I do not want to pay to host a server to do something once a week).
The lack of port forwarding is a pretty big shortcoming for me. I just recently switched away from mullvad for this reason. :(
They yearn for the (crypto)mines!
Turns out I did not try enough instances! Piped.lunar.icu threw a certificate date error and piped.yt threw a js error (or semething). Piped.video works fine!
This is on PC.
I’ve tried a few different instances and videos will not play. I’m using Brave and a VPN: blacklisting issues?
It isn’t even close. I’m glad this makes the decision so easy!