in reply to @ 2015-343 13:19 UTCThey can't really prevent it from happening — even if they had "all rights reserved" that only gives them the legal right to have it take down and/or sue. You can never fully prevent it.
As it is, their best bet is probably to post their own music for sale themselves, and use their brand and fanbase to make their official postings the most popular ones. The people posting their music are doing nothing wrong, and especially if the band is not listed on that platform yet are doing a service exactly in the spirit of the license.