You'd assume so but as others have recently started posting in the comments on this thread, maintainers for small projects regularly get barraged with demands and spam/other forms of aggression in retaliation for not meeting said demands.

I'm not sure why but some people like to assume that just because you posted something online that you must fix any problem people have while using it and add any feature that it doesn't have. I suspect that this is the main reason those "This is a hobby. Please don't get mad at me if there's a problem" README tags started showing up.