It is way cheaper to ban everything in sight than have the copyright holders' lawyers banging at your door for infringement. All the rest is just bad support, but ustream are covered by their terms: "[...] we also reserve the right to terminate the Site, Services or your access thereto at any time and for any reason". Using this kind of service as your unique way to broadcast is not the way to go. Next time you are using a free service with such terms, google for all the other similar services and use them as well. "Always have backups" applies everywhere.