There is a federal eviction moratorium in effect on federally-subsidized and federally-backed housing [1]. Many states and cities have more-comprehensive moratoria in place.As I said, the problem isn't the US isn't throwing money at the problem, the problem is that there isn't a cohesive plan being articulated for how to get out of this. We probably won't have millions of people driven from the homes, penniless and living on the streets now that moratorium you linked to has ended (it's end is in fact what prompted the OP, btw). But these measures look haphazard and temporary - and just looking haphazard is enough to create a sense of panic in people (good leadership both is organized and clear and appears organized and clear).
You're wrong in that European aid programs in total are larger but that's not the main point. The point is that Europe and all most industrialized nations have dealt with the situation as a crisis during which people will get help and be somewhat guaranteed safety and a crisis, which once it goes away, people can return to normal from. The messaging the US has been a spew of confusion - the "opening up" a month ago was disastrous both in terms of spreading the disease and in terms of casting US leaders in total as confused incompetent morons, and that won't make it easier for them to lead.
And leadership is key here. What people are told to do is as big a factor in spreading the virus or not as any particular measures. And that goes for the situation of landlords and tenants. As the article correctly points out, leadership is needed to protect landlords from themselves. The current situation gives the impression everyone is on their own. Even if some aid does arrive, congress makes a strong showing that no one should count on that aid and that doesn't cause people to behave well.