Good question. Hard to predict. With in-person classes it would probably be more difficult now, as universities are much more stringent about maximum enrollment

Good question. Hard to predict. With in-person classes it would probably be more difficult now, as universities are much more stringent about maximum enrollments and much more concerned about managing risk. With Zoom classes, I doubt it would make too much difference. Professors are perhaps more concerned about their workload, or about maintaining some kind of class "community", and so might be somewhat more likely to say no. But I still think it's worth asking.