Because Apple has been inspired by them, not out-right copied them.

Apple take ideas from Braun and put them into different contexts (products). Samsung have taken Apple’s ideas and put them into the exact same context (or so the argument goes).

Another reason: The Braun designs that Apple have been inspired by are decades old by this point. Most of the Braun products don’t have these designs anymore (Aside: IMHO I think they current design is inferior to a lot of their older stuff.)

EDIT: Removed something that I don’t think was accurate.