Somehow I don't think Apple is going to put Adobe out of business.

They don't need to.

They want marketshare to enhance their other market positions and give them optionality for future strategy.

They'd love the whole market, but they don't need it and they won't employ too many resources chasing that.

They're a powerful giant with hands in so many places. Each enforcing other endeavors.

This encourages people to stay in the Apple hardware ecosystem, for instance. It dog foods their silicon. It keeps people thinking of Apple as the creative brand and operating system. More creatives buying Apple -> more being produced and consumed for and on Apple.

Also the strategy of getting kids young has always been genius. They started that in the eighties, I think.