"The thing we don't like with this is... they're dictating terms."
Gary Fung, owner of BitTorrent Isohunt, said that only 21% of its traffic came from Google.
"We have plenty of torrent links to non-copyright infringing content, and we'll be adding 1.4 million more from the Internet Archive soon," he wrote on an Isohunt forum.
Mr Fung also queried the validity of the removal notices which he claimed could be spammed.
Those wishing to protect their copyright on YouTube are encouraged to use a free tool called Content ID which digitally fingerprints their work and notifies them if it appears on the site, Google said.
The copyright holder can then decide whether to leave it, have the content taken down or make money from it by adding adverts.