> or instance, because they like vanilla Android (which barely exists anymore outside GrapheneOS and perhaps Lineage)

Absolutely. Vanilla Android is actually very nice, and compatible with many types of devices (phones, tablets, TV boxes, now some laptops). In fact, I recently compiled and patched an x86_64 version of LineageOS for an HTPC and it blows ordinary Linux distros out of the water in that role. Fully usable with remote only, etc. The problem with Android is that commercial versions people are used to are riddled with Google spyware and OEM crapware.