> What if after "age checks" are put in place many www users stop using these "platforms." No doubt EFF would try to argue that's somehow bad

I would love for people to stop using the evilcorp platforms. But what will actually happen is that normal people will just scan their IDs and continue as before and only weird geeks will refuse. Normal people will continue posting valuable information on YouTube, Reddit, Instagram, etc. and it will become increasingly impossible to access any of it without scanning your ID.