Except for that most of it was not.
A lot of the noise on the screen (and speaker) was affected by radiation from nearby stuff.

I’d think that nowadays, it would be even more so, with way more WiFi and mobile phone signals everywhere. Now sure, different frequencies mean they would affect less, but the cumulative effect would still be more than the CMBR.

Also, I have a flat-screen CRT at home.

Oh, how many times have I wished for a pointer to just null itself.
This one, depending upon how it gets implemented, should be a really good one.

Imagine if there was a hack so bad that it caused everyone to become unable to develop in C and C++.

Well, there is one that will imply you can only develop using anything that you have bootstrapped yourself, using hardware that you have designed and manufactured yourself, using tools that you have designed and manufactured yourself, using tools that you have designed and manufactured yourself …

… with your own bare hands.