it's worth noting that no actual security problems have been presented that haven't been dealt with, Sandboxing is available on any distro assuming the tools are made availible. Waydroid supports both apparmor and selinux, please report any security issues and tag the maintainers when doing so.
EDIT: you do need to set apparmor into enforce mode manually though.
It's still really basic, but has loads of potential, Unforunately it has a hard requirement on GTK, otherwise there are a few things that would have been nice for greater AX86 in general, for instance they have mediacodec->vaapi support, something ax86 has... struggled with in the past. but we can't use it since we can't use gtk.