Some gambling site already offered tutorials on how games that are found on their sites are played, every games have tutorials everywhere, you can ask a friend, you can check Youtube, you can read articles you can ask here, tutorials are not really that hard to find, only on strategist on how to win, is one tutorial that are hard to find.
That is somehow true, but isn't it better if the website itself will offer the tutorial? In this way, they can at least give the players the proper introduction to the game and they will be able to try it unlike in just searching for tutorials in the internet without being able to try it themselves. This is much better to fully understand the game.