And if Apple or this service is de-legitimized through Apple going out of business and shutting it down in a decade or two (hey, it could happen) - or due to licensing disputes down the line with the record companies. Well.. Hope you backed up the original files. That's a good question, actually:

If you keep the old files around, and five years from now cancel the subscription.. ultimately it's likely you've paid much, much more than the original collection was worth. Are the old ripped files still legitimate, or do they cease to be?