Aside from magically happening upon internal memos, what evidence could I possibly have? I am using simple reasoning, extrapolating about the future using data

Aside from magically happening upon internal memos, what evidence could I possibly have? I am using simple reasoning, extrapolating about the future using data observed in the past. It seems a bit underhanded to demand evidence of the intent of a corporation. Microsoft is, quite literally, famous for their EEE strategy. And, as a major corporation, their decisions are based on forecasted returns to shareholder value. Those two facts support the idea that Microsoft purchased GitHub as part of an EEE strategy on git. What we should be arguing about is how strongly they indicate that is what Microsoft is playing at; history has already shown that it is a definite possibility.