Unfortunately, no. Vivaldi followed in Chrome’s footsteps some time ago and disabled MV2 extensions. As far as I know, the only Chromium-based browsers that still have some access to MV2 are Edge, Brave, and Opera. Although there have been recent rumors that Opera also plans to follow suit and end support for MV2.

It seems that, over time, continuing to support MV2 on their own and against the grain of Chromium’s main development has become too much of a burden, and they’re gradually phasing it out anyway.

No it’s not. The main company is Russian and they try way too hard to hide the fact that they are from Russia. They constantly creating new sub companies in Estonia, Cypher, UK and some more and transfer the HQ there while main Company is still in Russia along with CEO that owns it.