Versioning update to Document Libraries in team sites in SharePoint Online and OneDrive for Business

I can't see how Microsoft have the right to amend a library versioning settings to a new default, IF the users have amended the value from the default to meet their specific needs. 

We have a number of projects that have large files and in some cases the Project Managers have reduced the version limits to 10 to save space. That is their business decision. 

Following this change will I need to notify all our Site Owners to re-review their Version settings (no small task for a company of 40,000 employees.