In my opinion, some of the most unique advantages of online gambling is that you can do so anonymously in the comfort of your own home.
Another advantage that I factor in when playing online is the ability to play poker without having to sit at a table with 10 annoying people

Still by playing Online you can't know if any other gamblers are cheating against you

So being with a dealer and security / cameras and so on is more safer way for you to get proper winnings.
And especially for those people where in their countries, gambling is totally illegal and if you will found accuse for playing gambling they can even put you in jail. Therefore now they can play gambling anonymously without telling about it to anyone.