Because they make billions, and they have to spend it on software development. That these software devs then go out and build slightly different offshoots beca

Because they make billions, and they have to spend it on software development. That these software devs then go out and build slightly different offshoots because of business requirements and technical requirements is, in many ways, incidental. Devs at smaller companies end up writing poor-man's equivalent of various techs all the time, or write interesting things in their spare time. It just doesn't get the same attention because they're not as big.