Footballers care about reputation, they get huge money from sponsorships. I suspect it was part of the reason he didn't put a transfer request in.
Wenger is obviously hoping he will act as a professional, as are Liverpool with Coutinho and Southampton with VVD.
Still if all is as they are reporting then as Monaco had to do with Mbappe in the end Arsenal will have to let him come to us the only difference being Arsenal are getting nothing only a loan fee from us.