[dorfsmay]

Yes. Financial stability and conflict of interest are two orthogonal issues.

The worst case scenario with Github closing the door, assuming no heads up, is that you'd lose your issues and PR. You have your git history on a bunch of machines (your devs + you should really have a dedicated backup).

The worst case scenario with Microsoft having visibility of your "closed" source code is that they take a peek at it and implement a better faster more integrated version of them in their own product competing with you, or heck even copy/paste your code. What can you do about it? How could you prove it? Remember, they can afford orders of magnitude more number of lawyer hours than you.