Direct communication with their head of support do not deny this but will not enclose too much about what may flag you for review or why the others who have "confessed" were.

In addition, they claim they will not delete anything and give you time to migrate if you are actually flagged for any review and found unwanted for any reason.

I suspect shared links etc. may have been a factor for some. Not long ago they had a written TOS limit of 10TB, and for some it may seem they still want to keep people at that limit.

A concern is that it's only for consumers, while companies get far less. It's easier to screw over consumers than companies data if they change their minds.