alt Hacker NewsVolla just Eurowashes/rebadges other low to midrange phones at a huge markup. E.g., the Volla Phone Quintus is:
https://www.amazon.ae/Android-Smartphone-Storage-Octa-Core-M...
(If you don't believe it from the identical specs and design, you can look at the committers in their kernel trees and it is basically maintained by Daria people.)
Their new Plinius model is just the Gigaset GS6 with a 250 Euro markup:
https://www.gigaset.com/gigaset-gs6/
At least this is made by a German company, though Gigset is Chinese-owned now.
At any rate, these are just rebadged phones and IIRC, but don't hold me to it, in both cases the original phones also support bootloader unlocking.
It takes more than an unlocked bootloader to make Linux boot on random phones and work properly (and ensuring all the radios, camera, audio, phone calls etc work), and Volla have achieved that with their phones. I could be wrong, but I don't think it was possible to get a fully functional Linux distro going on any of these rebadged phones before Volla got to them.