I just watched someone complete their tax return online through a commercial service. At login they were asked for a phone number, which she refused and chose

I just watched someone complete their tax return online through a commercial service. At login they were asked for a phone number, which she refused and chose "skip". When she got to the end of the filling, just before submission, the system refused to move on without a mobile phone where text could be sent. Oncethe text message was sent, moved on. No way to remove the number from the account. There is no need for the number. Deceptive design in the beginning then extortion at the end. There are people without mobile phones by choice and by force.