Deezer does not support Google products (Home, Nest and Chalk) in Serbia. Not sure if there are any legal obstacles but from the technical perspective It's a shame you have supported it selectively. Using Deezer with Google products was my number one driver for buying devices and now I find them useless, unless I decide to cancel my subscription and join Google Music service.
Number of topics related to Google Home not being supported in a specific country is emerging. I can see most of those dissatisfied customers shortly turning to other services. Hopefully something could be done in a timely manner. Providing us with the answer that it is up to Google to decide about global partner is equally dissatisfying. Surely it is negotiable since Deezer supporting Google products started only for France and than the service was broadened to several other countries. Hopefully something could be done in a timely manner.