I feel like I can mostly use containers on macOS. Is there a different sense that people are using containers on *nix? Or are you referring to all the macOS specific software footguns?

I would like to be able to run arbitrary code with gradual/granular privilege escalation. (e.g iOS/android with more affordances and escape hatches. macOS is getting there, but it's been a pretty bumpy/potholed road). Right now if I download a random github repo, I'd put it in a docker container and give it ports/volumes/etc.