It looks like the Sync EULA was updated August 26, 2014. http://www.bittorrent.com/legal/eula-sync "Subject to your compliance with these terms and conditions, BitTorrent, Inc. grants you a personal, freely revocable, limited, royalty-free, non-exclusive, non-transferable, non-sublicensable, non-assignable license to use the Software, solely for your personal, non-commercial purposes, except that you may also use the Software for internal use as an end user if you are a business. BitTorrent, Inc. reserves all rights in the Software not expressly granted to you here." Emphasis mine. Don't know what it said before, but it now appears to explicitly allow internal use in a commercial setting. Don't try to resell it or package it with your own product, in other words. Which would appear to be in line with the sync hacks they've blogged about.
