Maybe it's part because of psychological politics.
The market leader (that is, Apple/iOS; the numbers are irrelevant, they feel they're the leader today) is usually hostile to number 2 but friendly to number 3. While number 2 is usually hostile to number 3 - look how Google tries to bully WP.
(For example, MS used to bash Linux but kind of threw a bone to FreeBSD)
And this translates from companies to companies' customers.
The market leader (that is, Apple/iOS; the numbers are irrelevant, they feel they're the leader today) is usually hostile to number 2 but friendly to number 3. While number 2 is usually hostile to number 3 - look how Google tries to bully WP.
(For example, MS used to bash Linux but kind of threw a bone to FreeBSD)
And this translates from companies to companies' customers.