Just remember, the license fees mostly don't go into development, or maintenance, or security, or any of that, they mostly pay for "sales" which includes a strong component of end customer support. When you divert "all that money" into FOSS, FOSS development and maintenance might be lucky to get 20%, the other 80% will be spend training and employing tech support.

And there could be insight into whether the money is actually used for developing the relevant application.