80 Characters wide used to be the standard. In my company it seems to be 100 characters now. I'm fine with a 100. As long as there is a standard.
Of course, some &%*(#(%s don't care. And they type 120, 160 or even 200 characters wide. I am sure that God is reserving a special place in hell for them now.
It seems these people who put 600 characters on one line still live in the 1980s. They alway use just one window. And they just switch between multiple sessions inside that one window constantly. But at any time they will have just one window on their screen. And as they have 16:9 screen, that one window they use can be 120 lines high, and 400 chars wide. And you know dumb people: if they can do stupid things, they will do stupid things.
I myself have evolved a little beyond the 1980s. I like to use multiple windows simultaneously on my screen. If you have multiple windows, you can't make them 300 characters wide. But what do the others care ? It's not their problem.
Similar topic: why write comments in your code ? You've written it yourself, you have a good chance remembering what you did. Others ? F them. It took you a lot of effort to write that code, it should take others a lot of effort to read that code ....