I will do that just to make sure.
From below
1) The operations from SSIS are not bulk import
2) Last line : new pages are not compressed.  The compression...

Checking my scripts, yes.  I just found 12 tables that were compressed Friday now have

data_compression = 0

The "they" is a small group of people that are doing both ETL and report type job functions.  "they" are using SSIS and T-SQL jobs to import and export data...

I have googled this a lot.  Read dozens of article.  Searched the archives here.

Yes, after 3 to 5 days running production, I see disk space has balooned again. ...