Always free ATP/Datawae House: who/what/why is consuming all that storage?

Summary

Something is consuming all "my" storage

Content

Hi,

I activated a ATP and Dataware House databse, always free, on ah shared service.

I did not developed anything yet, but I notice that the storage used is increasing.

This was as posted earlier by someone else but there was no final explanation/solution why this happens, what is causing this consumption of storage.

Is this experienced by others customers? 

Can someone from Oracle help me out?

Regards