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.
The OrganicMaps for "regular" Linux is very different from the Android app though. Completely different UI tech (Qt vs native Android widgets) and lacks important things like turn-by-turn navigation.
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.
They really shot themselves in the foot by going straight to phones.
The better way would have been to work on tablets first and working out all the bugs on larger devices with a limited feature set before moving into phones with the attendant issues of regional cell bands and restrictions.
tablets (especially ones that could be flashed with Linux, i.e. not iPads) are way less common than smartphones, so you get fewer devices to choose from for testing, fewer users who can run it, report bugs, and support the project, and less interest in general.