Due to the legal risk involved in online gambling Google intends to exclude it from Google Cast app.
Developers received a warning along with the Google Cast software kit indicating that Google will not accept certain material and gambling is among other restrictions such as porn, drugs and fraud.
Google is concerned with legal risks that it could be open to in allowing such apps in association with Google Cast. The company is taking a cautious approach to avoid issues with various jurisdictions and legal problems.
The notice to developers implies that Google will utilize its power to ensure that the publication or transmission of content it considers inappropriate will not be available in association with Google Cast.