Why should someone be happy to deal with work stuff outside of work hours? It seems to be a thing in the US, but not in Europe or other places.
Which I think is perfectly reasonable.
That's interesting. As someone who works from Poland with US companies, this is opposite of what I do. There is little common time despite me being very much not a morning person, so I think giving ~20 minutes of my evening by responding to people in US is very reasonable.