Sure it only affects 50 people /now/, but this kind of a thing is really slippery slope. What's to stop the application of this process to other issues that the government would rather journalists not be looking into?
No it's not. The headline never says "all", you added that. The fact that the number is greater than 0 is a problem.
I disagree, CBP targeting people who frequently cross the border for extra scrutiny, some of whom happen to be journalists, is a far cry from "the US" tracking "journalists" in general. It is an alarmist headline