Next to no one uses Chromium. The integrations usually start in Chrome, leaving Chromium pure, allowing Opera etc to forge their own path. This is a disturbing trend to change the course of the project, likely due to Edge being based on Chromium.
I bet a decent chunk of the MS engineers lobbied to adopt Gecko instead of Chromium when they decided to move away from EdgeHtml. I wonder what the reasoning was for not going that route, it seems like a huge miss and a total acceptance of a browser monoculture.