Boycott (loudly) websites and buisness that implement this scheme. Maybe file customer support tickets and play dumb. Maintain/use a forked version of chromium that has this patched out, then file more customer support requests showing the websites broken. Chromium is advertised as open source, so exercise it! Force Google to admit that Chromium is not open source. Other than that, this is anti-trust territory, so it would require political/collective legal action.

Not so different than dealing with “This site is designed to be used with a modern browser. Download Chrome to continue” bullshit, just cranked to 11.