Also, here’s a solution: Just don’t use Chrome or any Chromium-based browsers.

Provided your bank has not stopped supporting your "non-secure" browser. The previous browser vendor that had a functional monopoly did abuse user-agent to harass the competition. Using non IE required changing your user-agent to IE/Windows for a lot of sites.

Or as they say:

Websites will ultimately decide if they trust the verdict returned from the attester.

It is expected that the attesters will typically come from the operating system (platform)

There is... ...the risk of websites using this functionality to exclude specific attesters or non-attestable browsers