Because compared to other OSes Apple just catches up.

Does Linux have a marketing team?

No marketing team = no enshittification by marketing

Is there a Linux corp we haven't heard about that's working with some chip manufacturer we also haven't heard about in order to create ARM processors that can compete with Apple silicon?

So you agree that transitioning to ARM isn't impressive. Now it's time to show you that making processors isn't something only oh-so-great Yoppl can do. Linux Foundation has its own chip designing subsidiary - CHIPS Alliance. They designed stuff like vector coprocessor, RISC-V core(and older VeeR cores), maintains Chisel HDL and many smaller projects. And I only named what only Linux Foundation does, community and other organizations(including chinese T-head) do even more.