What indication is there that any new restrictions are being placed on a user's content? The blog post from Google only mentions the change of sending email notifications to users.
It has something to do with their "abuse program:" https://support.google.com/docs/answer/148505?hl=en. I can't find a date on this, but I assume that this article is about the implementation of this program.
Again, none of this is new. People have been abusing Drive to host illegal file for years, and have been getting banned for it. The only change is that now you get a notification and can dispute it. It's a strict improvement.