Hoi,
Facts are in and of themselves not copyrightable. Collections of data may be copyrighted.We choose not to and as a result Wikidata is the powerhouse that it has become.The CC-by-sa license is our license of choice for Wikipedia however, the way it has been enforced so far has been defensive, we are quite happy when our material is used.
At Wikidata we are long past the point where the majority of the data is from a Wikipedia. From day one Wikidata has provided essential services to every Wikipedia, Wikidata can provide superior services to Wikipedia. Because like Commons, we have to maintain the data only once and have it available everywhere. Wikidata is instrumental in sychronising death information among our projects. It has been shown over and over again to have more complete information as can be found in Wikipedia lists and categories. Wikipedians choose to stick with their arguably substandard practices.
The notion that a Google or an Amazon are not capable of extracting facts from a Wikipedia is silly. They have the capacity and the skills and the software to do just that. Wikidata provides them additional information making their information more complete. They have their reasons to be model citizens and contribute to the Wikimedia Foundation. We now provide paid for services to them making their bot activity less of a strain to our services and provide them a (paid for) service.
Thanks,
GerardM