I don't mean to strawman but are you saying luxury businesses should be able to get away with not delivering on what their customers pay for because we are in an unexpected situation?
It is saying "what you are upset about does not matter. Don't bother someone else with it", which is both an insult and correct.
It's really the issue on the part of the ISPs for not being able to provide enough service to support everyone's internet activity.
If Netflix wants to help them out with that issue they also have to bear the cost of helping them out with that issue.
If a university closes because of the pandemic they sure as hell won't charge room/board, and (if they're kind) won't charge as much for online courses.
The price factor is irrelevant ("a small sum"), and if it is, Netflix should have no problem refunding "a small sum".