Why? Containers are not insecure, some implementation of them have some vulnerabilities. That doesn’t mean that namespaces are insecure, it doesn’t mean that cgroups are insecure, and there is more than one container implementation (such as podman and cri-o).

That sounds like a reductionist argument, unless you have some more concrete issues than just “they are so insecure”. And having VC money is not a problem per se.