Posting about Volla in a GrapheneOS thread is... I guess courageous?

They are kind of the opposite of GrapheneOS. Ancient kernel trees, ancient firmware bundles, etc. And since downstreams like /e/OS just take their kernels/firmware, they are ancient as well. Using Volla phones opens you up to a lot of known vulnerabilities.

Besides that, Volla is basically a marketing company (with some external contractors) that does Eurowashing. E.g. one of their phones (Quintus) is a phone designed by an Emirates company, produced by a Chinese ODM, marked up by 500 Euro by Volla (they probably turn some screws and flash the firmware to be able to call it 'from Germany'. You can get the same 719 Euro phone here for ~160 Euro:

https://www.amazon.ae/Android-Smartphone-Storage-Octa-Core-M...

I don't understand why people do free promotion for Volla, given that they are mostly snake oil salesmen.

I don't see anything they offer for security that's not also in AOSP/LineageOS/eOS/stock/etc.

Which is not to say that's not enough for most people, but why highlight them? It doesn't seem comparable to the laser-focus GrapheneOS has on security

Those are much less private and secure than the Android Open Source Project on Pixels without the major privacy and security improvements of GrapheneOS. Those aren't privacy or security hardened devices.