Apple collects such data from customers who have approved the use of location-based capabilities on the phone and who actually use an application that requires GPS.

When users attempt to download apps or media from the iTunes store, they are prompted to agree to the new terms and conditions. Until they agree, they cannot download anything through the store.

it's just that they're more interested in performance and functionality

Sure, there are enzymes which break up DNA - they're used all the time for sequencing, as you can't sequence long strands. But to identify a malign region in the DNA =and= have the enzyme only break the DNA at that point =and= have this done in a way that won't cause the end result to do strange and undesirable things -- that's going to be tough.