You don't seem to understand the power balance here. The client is in no position to demand anything, since the article author can just tell them to scram, and they can solve their own problems.

Working with corps is not a problem. Unless you have a slave mentality that is, and let them bully you and stomp all over you. If they have their wits with them, they will fully understand what negotiating position they are in, and not make unnecessary demands on the software creator.