A rough translation of the principle of Ubuntu is "humanity towards others". Another translation could be: "the belief in a universal bond of sharing that connects all humanity".
My update told me as much. OP's likely did too. But it is usually a lot harder to manufacture outrage when you have a full picture and manufacturing outrage is the best way to get exposure on social media.
Not absurd at all really. Do you think Canonical did this out of the blue for zero reason with no brainstorming whatsoever? When you look at the rise in popularity Linux is seeing it makes sense for private companies like Canonical to look at other ways to pay developers for all the extra work that comes with more users. With the five machine rule they separate the average users from the businesses that have money they absolutely should be sharing with Canonical if they're using Ubuntu. Without it, you can rest assured both the quality and features of the product will be reduced resulting in even more outrage.
No one is forcing you to use Ubuntu. There are plenty of other choices.