That would only work for things that use libc (so eg. most Go programs are probably not going to work). The main way that you can do an unprivileged fake chroot

That would only work for things that use libc (so eg. most Go programs are probably not going to work). The main way that you can do an unprivileged fake chroot is proot, which termux does offer - see https://wiki.termux.com/wiki/PRoot https://wiki.termux.com/wiki/PRoot - but that has a significant performance hit.