That is exactly the problem. Linux containerisation is done by building tooling that uses kernel-level features. You don't need a start-up with millions in VC f

That is exactly the problem. Linux containerisation is done by building tooling that uses kernel-level features. You don't need a start-up with millions in VC funding to implement the basic feature-set. At the other end of the complexity scale, both flatpak and systemd-nspawn are more specialist containerisation tools, which are each largely the product of just one person.