Put a gentle "Use Firefox" (or any other non-Chromium-based browser) message on your website. It doesn't have to be in-your-face, just something small.
I've taken my own advice and added it to my own website: https://geeklaunch.io/
(It only appears on Chromium-based browsers.)
We can slowly turn the tide, little by little.
Even if you explain what is the difference, 99% they'll forget the next day.
It's just pointless. With this kind of overreach, only government intervention and regulation can help. Google is not something you can go against with your proverbial wallet - they are too big.