They have identified the core of their business and they feel comfortable there. They get a 30% royalty for each App Store transaction, they make large profits selling iPhones and Macs. They monetize their software indirectly as a part of a larger end-to-end solution.
Microsoft during their monopolic era was much more beyond that, they were going for all.
Yes, absolutely. Bill Gates was not a "nice" man. These days many people fawn over him "oh he's so lovey dovey, he's going to save the world with all his money as a philanthropist". LOL -- how many have actually sat at the same table (behind closed doors) with Billy boy pounding the table telling everyone attending (ISPs, major telecoms) how Microsoft was going to run the show, run the world. Microsoft is a ruthless company. Satya Nadella was part of this ruthless culture when he first joined MSFT 25 years ago. Why would the ruthless culture of Microsoft suddenly change because they've figured out how to peg Ubuntu Linux to the kernel? Ever hear of a Trojan Horse? This announcement today sure smells like horse manure.
There's also a logical fallacy that because Nadella worked for MS for the past twenty five years, he's as power hungry as Gates. This reeks of the type of elitist nonsense the keeps people from wanting to adopt Linux.
EDIT: Removed insult, came with arguments instead.