i think it will also depend on the financial situation of a person. i do not speak for myself by the way.it is logical that if you are in a financial bad situation, its tempting to keep funds that you accidentally receive, because it is not a bank transfer but crypto, which gives much more anonymity. the sender should be more careful it think. but that is an ethical discussion.
well, probably most people will say that they are going to return ethereum which they feel is not theirs in their wallet. however, in reality, it depends on the circumstances. I am pretty sure that some people would prefer to use it because we never know what is in someone's heart.
Don't get me wrong, I have seen many acts of kindness from cab drivers in our town. The 15 minutes of fame on TV where the media reports their kindness, and the sweet promise of rewards from local authorities. So I guess many will do the same deed of kindness like the cab drivers. But human nature also gives us people who has like I argued before the finders keepers attitude. More like they do not want to return the money thinking that it is the stupidity of those who send. But what the heck, this is the crypto and I don't think people will be careless enough to send money accidentally to an incorrect address.