If you use a browser which supports attestation you will be denied service by companies who disapprove of what you run on your computer.
If you don't use a browser which supports attestation you will be denied service by companies who disapprove of what you run on your computer.
So everyone loses. If this goes live everyone in the world loses.
It is an utterly heinous proposal. It is perhaps the worst thing Google has ever produced. I use Firefox and will never use any browser that implements attestation, even if I have to stop using most of the WWW one day.
But unfortunately individual action is not going to be enough here, because no matter what you do, you lose.