"Can't" indicates they are unable, whereas I suspect at least some are taking advantage of the current situation [1]. Any situation where it's possible to take advantage, you can almost guarantee that people will.
This is not the way forwards - not paying rent will have a large knock-on effect for landlords (which, despite some sentiment, isn't necessarily the 1%). The US government needs to provide money if they are going to demand that people stay at home and not work.
Ultimately they either bring the economy to a screaming halt (entirely) or trickle money to those unable to work in order to keep things going. In my opinion stalling the economy is a bad idea - it can cost a lot of time and money to get it going again.
[1] https://news.yahoo.com/rent-strike-idea-gaining-steam-170345...