Ah, so I found an even better source than wiki page in the import guidelines.
OSMs legal FAQ states here Licence/Licence and Legal FAQ - OpenStreetMap Foundation
Can I import data that I own the Intellectual Property in?
Yes. However, be aware that once you do so this data can then be made available freely under the ODbL terms and, where to the extent received by a user under ODbL terms, you will not be able to charge or place any other license controls over it.
Can I import other data which is also subject to the ODbL?
Yes, see the Import Guidelines for non-licence considerations.
So the process is:
can be made available under ODbL terms => no licence check nessesary