Why do you think Microsoft put a check?
Glad more people can play it now. The same could happen with other SE Switch exclusives, like Bravely Default II (and the entire series, for that matter) and the future Triangle Strategy.
I mean, they might have not paid for exclusivity but they obviously paid to have it on GP day one. I have been saying for the longest time that Square Enix is playing 3D chess with them all, taking money from either Sony or Nintendo for timed exclusivity and then taking money from MS for GP. I think it is highly possible that FFVIIR will come out day one on GP in a few months.