They weren't ideas Apple copied and claimed as their own - they were existing products.With that said, let me think and remember one product that has not been based on an idea ... I'll get back to you if I ever recall one.
I don't think anyone cares about building on someone else's concept. It is the habit of taking other companies to court for looking too similar to your particular copy.
It was only a few short years ago that Pandora was on stage with Steve Jobs helping boost Apple's credibility but I guess Pandoro actually believed Apple doesn't steal ideas because Apple has just stabbed their 'partner' in the back with their 'own' iTunes Radio service. Wow .. Apple just continues inventing new products every year !