Billionaire investor and dot-com veteran Mark Cuban had harsh words on Thursday for YouTube, the online site that lets people share video clips, saying only a "moron" would purchase the wildly popular start-up.

Cuban, co-founder of HDNet and owner of the NBA's Dallas Mavericks, also said YouTube would eventually be "sued into oblivion" because of copyright violations. "They are just breaking the law," Cuban told a group of advertisers in New York. "The only reason it hasn't been sued yet is because there is nobody with big money to sue."

YouTube, based in San Mateo, California, specializes in serving up short videos created by everyday people. Its popularity, with more than 100 million video showings daily, has spurred speculation the firm will be sold or taken public. YouTube company representatives were not immediately available to respond to Cuban's comments.

YouTube, which has nearly one-third of the U.S. Web video audience, three times that of Google Inc., or twice that of News Corp's MySpace, has been working on signing licensing deals with music companies and TV networks to ensure they are paid when users view their content.

This month YouTube unveiled its first deal to distribute music videos legally from a major music company by agreeing a deal with Warner Music Group, home to pop stars James Blunt and Madonna.

In other remarks, meanwhile, the often-controversial Cuban also told advertisers that the reach of YouTube is limited, particularly when it comes to user-generated videos.