Well, while it is surprising it's all happening within a year or so, it's not unexpected at all.
They're ultimately for-profit companies. They have openly demonstrated the obvious truth that when push comes to shove, users don't matter to them, at least not as much as money. Our attention was the product.
These companies have proven time and time again that a quick moneygrab will win over retaining the people who make the site work. capitalism 101 baby.