There's not a single reason to assume this administration is acting in good faith in any scenario. The correct way to look at all actions by this administration is to ask yourself, "how does this help trump?" Most of the time it is money (or staying in power => more money), as it almost certainly is here. He's looking for a payout for selectively targeting microsoft. That's it.

And when trump does something which clearly hurts himself, you have to remember that he is fantastically stupid, undisciplined, and insane.