I'm only finding some quotes from industry insiders and U2 management, not the band themselves, regarding the 100 million. I'll have to take your word for it, as Apple has made a Youtube copyright claim on video from the official announcement day. lol
EDIT: Nah, Bono was evasive to Time magazine. He admitted to getting paid, but would not divulge the amount. Well now the truth is out there for everyone to read, along with the U2 virus.
Bono On U2s Not-So-Free iTunes Album: We Were Paid
Giving away Songs of Innocence wasn't some grand gestureit was business
http://time.com/3313164/bono-u2-apple-itunes/