Multi data center was restricted to Riak Enterprise and required a paid contract. That's what I was referring to, as your comment was talking about data stores that supported multi-region or multi-cloud.
I really hope that the Entreprise version will be open sourced and will be happy to add it to the list of multi cloud options. At the moment, I can't do it in good faith since it's not gonna be released any time soon, and it's impossible to procure now that the vendor is bankrupt.