The effectiveness of the claims or policies relies upon the meeting criteria of extraction. For example, the web owners in the US can use three major legal claims for preventing it- a. Copyright infringement (compilation), b. Violation of the Computer Fraud and Abuse Act (“CFAA”), and c. Trespass to chattel.
Likewise, In Facebook, Inc. v. Power Ventures, Inc., a district court tried in 2012 that Power Ventures could not extract FB pages on behalf of a Facebook user. For more information please visit Eminenture.