Bootlegs from crappy phone recordings at gigs are a weird issue.
I'd have every sympathy with Prince about distribution of original material - DVD rips / music rips etc. But amateur bootlegs....?
He'd be better off following Metallica's example - you can get a 'desk-mix' from them of almost every show they did over the last few years, usually only the day after the gig.
I still have old tapes from going to Donington 20 years ago. Well dodgy sound, but the occasional blinding song audible out of the sound of airborne bottles of piss.
Happy days!