There aren't many online casinos that offer free bonuses that can be played on the table games. There are a few online casinos that have special bonuses for players that enjoy playing blackjack, roulette, or video poker but the vast majority of bonuses will only cover video slots. You'll need to check the terms and conditions for different online casinos to find those that offer bonuses that permit play on the table games.
The reason that the online casinos typically do not permit bonuses to be used for play on the tables games is because the table games have better odds for the player, and there is a bigger risk that the player will find an advantage by playing these games wih a free bonus. There is a much less risk for the casino if players can only enjoy the slots with strict wagering requirements, because the betting odds are in their favor.
Even some of the video slot bonuses will let you to play blackjack or other table games, but those games will not be included in the wagering requirements. Therefore, you would need to eventually play the video slots in order to meet the wagering requirements.. Make sure to check out the terms & conditions for the casino bonus to find out more about which games you can play, betting options, and wagering requirements.