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> Your Browser Agent string isn't Chrome or Firefox?

nowadays, you could update this to just "your browser agent string isn't Chrome"

Yes, how sovereign national browsers (not depending on US companies and not sending data to US) can be be developed in this situation?

As the browser you do not have to license Widevine. This is the responsibility of your OS vendor to provide and license a DRM solution. So for example when you build your browser on Mac it uses the Apple APIs to use FairPlay to handle Spotify.

It's unrealistic to expect every app on the system to have to deal with licensing DRM themselves.