Michael Appleton for The New York Times

After the Stop Online Piracy Act and Protect Intellectual Property Act were shelved on Friday, some Web sites and venture capitalists went on the offensive against the people and companies behind the controversial piracy bills.

Y Combinator, an early stage investment company, announced on its Web site that it planned to finance start-up companies that would go after Hollywood and the movie industry

Referring to Hollywood, Y Combinator wrote: “The people who run it are so mean and so politically connected that they could do a lot of damage to civil liberties and the world economy on the way down. It would therefore be a good thing if competitors hastened their demise.”

The blog post, which was titled “Kill Hollywood,” also offered advice to start-ups and entrepreneurs who wanted to help to hasten its demise. Suggestions included developing start-ups that created new ways to produce and distribute shows, and games that were similar to traditional shows but were more interactive.

Marco Arment, a developer and the founder of Instapaper, wrote a similar post on his Web site, stating that people needed to fight back against Hollywood after it managed to get the piracy bills into Congress.

“Such ridiculous, destructive bills should never even pass committee review,” Mr. Arment wrote. The real problem, he added, is “the MPAA’s buying power in Congress,” a reference to the Motion Picture Association of America. “This is a campaign finance problem.”