Serious question, though: how many services have they offered over the years that were free to anyone?
Free to existing Windows users, perhaps, but free to the world doesn’t seem like something Microsoft was historically in a position to offer, much less later kill.
Hotmail/outlook.com and OneDrive are two services that Microsoft has been offering for decades, for free (with a storage limit, but that’s nothing weird), no Windows required.
It's not randomly and suddenly killing off services, but rather suddenly (and not randomly) changing the pricing structure when companies have been committing to the point of lock-in for years on the free tier.