Eh wait. Copilot (any of the about 30 products with copilot in the name) is not a model. Microsoft makes a few models like phi but they're underwhelming. All of copilot runs on models from external parties like openai and anthropic. So basically Microsoft is at the mercy of their own competitors. They're in the awkward position that providing training data to their model providers not only improves their own product but their competitors' as well.

Additionally, Microsoft's most profitable market is enterprise and they would absolutely shiver at their data being used for training and would abandon the service in droves.

Despite being "all in on AI" Microsoft is in a really vulnerable position. Their added value is their integration with their other services (and data therein through RAG).