Microsoft continues its explanation on the same post:

Well, if you do that, what do you think will happen? A lot of users are going to take you up on it right? Microsoft announced unlimited storage for subscribers of certain Office 365 plans. Punish Everyone for the Actions of a Few? Current customers of standalone OneDrive storage plans (such as a 100 or 200 GB plans) are not affected by these changes.In addition, you can redeem a free one-year Office 365 Personal subscription (credit card required), which includes 1 TB of OneDrive storage. If you are using more than 5 GB of free storage, you will continue to have access to all files for at least 12 months after these changes go into effect in early 2016.If you are an Office 365 consumer subscriber and find that Office 365 no longer meets your needs, a pro-rated refund will be given.If you are an Office 365 consumer subscriber and have stored in excess of 1 TB, you will be notified of this change and will be able to keep your increased storage for at least 12 months.We’re taking the following steps to make this transition as easy as possible for customers: These changes will start rolling out in early 2016. The 15 GB camera roll storage bonus will also be discontinued. Free OneDrive storage will decrease from 15 GB to 5 GB for all users, current and new.

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.

Starting now, those subscriptions will include 1 TB of OneDrive storage.

We’re no longer planning to offer unlimited storage to Office 365 Home, Personal, or University subscribers.

I will just dive right into what’s going on for those of you who haven’t learned about the new OneDrive policy. Microsoft Kills OneDrive Unlimited Storage and More

Microsoft onedrive storage change