The good (and bad) thing about all of the technologies that make up "containers" on Linux is that they can be used by separate projects. Chromium uses seccomp,

The good (and bad) thing about all of the technologies that make up "containers" on Linux is that they can be used by separate projects. Chromium uses seccomp, systemd uses namespaces and cgroups, a bunch of tools use AppArmor/SELinux. But ultimately the reason that this is the current state is because of how Linux is developed. Trying to push something like Jails or Zones is an exercise in futility because the patchset would be too large, would touch everything, and the infrastructure would likely not be reusable by other people.