What's the big deal? Google already do this to Android AND they also host Hackathons where they invite people to do this and reward those who do.
Plus they have an ongoing bug bounty program so at anytime you can submit a bug/hack and get paid.
Apple don't have a history of doing this at all. This is literally the first time they are doing it because of the bad PR from Pegasus.
It shouldn't be applauded. They should be roasted for not having done this sooner