From the business perspective, it doesn't make sense to subsidize your free users' business needs. The article mention a backslash, but I'm not sure how much should they care about complaints from customers they have chosen to fire.
From the users' point of view, this is their 6-months reminder that a) you should read the terms of what you are agreeing to, and b) if you are not paying for a service, you get what you pay for. A harsh lesson for sure, but a lesson more people should probably learn.