The changes are as big as some of the movie collections that have been uploaded. Some have uploaded as much as 75 terabytes worth of movies, backed up multiple PCs and DVR recordings.
I'm pretty sure Microsoft would have been expecting some to abuse it. Offer free and unlimited storage people will use it.
Here's how the OneDrive storage will be changing:
We’re no longer planning to offer unlimited storage to Office 365 Home, Personal, or University subscribers. Starting now, those subscriptions will include 1 TB of OneDrive storage.
100 GB and 200 GB paid plans are going away as an option for new users and will be replaced with a 50 GB plan for $1.99 per month in early 2016.
Free OneDrive storage will decrease from 15 GB to 5 GB for all users, current and new. The 15 GB camera roll storage bonus will also be discontinued. These changes will start rolling out in early 2016.
Guess they should have had a cap on how much you could upload for free. That would have avoided any doubt as to where you stood.
OneDrive - https://onedrive.live.com/about/en-gb/