What use-cases are there for gVisor on Raspbian, given that the target is a Raspberry Pi?
<shameless plug> We're building a container runtime to do this, and we are comparing alternatives, that's how we got there: https://github.com/urunc-dev/urunc</shameless plug>
Why one would use gVisor is clear, but why would one do that in RPi?
consider that you can take advantage of all the cloud-native goodies, all wrapped up in a 10x5 box with 5-10W (or 25-30W if you consider jetson boards).