Researchers aren't (necessarily) philanthropists. They and the university both get a cut of the IP they develop to encourage them to both invent useful things

Researchers aren't (necessarily) philanthropists. They and the university both get a cut of the IP they develop to encourage them to both invent useful things and to get those useful things into production. If the commercially-viable fruits of this research had to be open-sourced it would be some half-commented github repo that no one would look at twice, because none of the researchers would have any incentive to make it anything more than that.