Using DRM to tie the music to the handset is a bad move.

Other companies also use DRM.

But Apple made a situation where to use DRM, one had to go through Apple.

Amazon uses both the Kindle format and DRM.

However, the system was eventually reverse-engineered, and free software drivers provided access to SD cards that did not use DRM.

Ericsson produced a proof-of-concept implementation that uses DRM based on the Marlin rights management framework.

Actually, IMHO that should also be the cost of using DRM.

It used DRM and enforces advertisement viewing, when watching videos both online and offline.

In other words, he doesn't use DRM.

They don't have to use excessive and stupid DRM on their OS, because they already made their money by selling you the computer.