This must be another speed bump by language barrier, but the original question quite often means ”is CDCK using customers’ data for own purposes as marketing”. Sure, you don’t, I don’t claim anything else at all. But it is big time different thing than ownership vs. to act as a custodian.
And again — I understand meanings quite differently than anglos every now and then, and there is chance it was really about ownership in the meaning ”can we take our database and files when we want and walk away”.
And then answer is what Sam said. Yes, every hosted customer can take and use database and files, and use theirs customers’, aka. users, data as they would be owners 
I have no idea what kind partner CDCK is at B2B world. Quite reliable I reckon because I’ve never heard anything negative. But Discourse itself works as it should in this meaning, world wide AFAIK covering differences between northern america, UK, EU (including stranger things of Germany), China etc.
And same applies to those few competitors too, businesswise. Discourse itself is always same, of course.