Hard Rock International has been around since 1971 and is well known for having wall-to-wall rock and roll memorabilia plastered across their cafes all around the world. Gambling problem in Ohio? Call 1-800-GAMBLER. Ohio bettors must be 21+ and present to place wagers in the state. 4 Hard Rock Bet Frequently Asked Questions.3 Hard Rock Bet Loyalty Program and Promos.