Strategy?
Hmmh, It depends on how lucky are you, if you are very lucky or good gambler, you can win lots of money, But if you won't have needed luck you can lose a lot
and i don't really think that there re such a thing as strategy, as all gambling is luck based so you can't have needed strategy
If you are playing poker against a real player then strategy is really needed to win. But if its online poker where your opponent is the house then you have no match to it and you must need luck to win. I think pro gamblers are not gambling online or in some sites where you will play against the house, they won't win from it because the house is monitoring their winnings. If they notice you that you win some big amounts they will get it back.
the professional poker players will never play online. have you ever heard of the phrase "poker face" it refers to the fact that you need to read your opponent in poker, that is why they are only playing poker face to face.
besides when you are playing online or even worse , playing online against the house, then they can see your hand and act accordingly because the code is giving you the cards and it can be not-random.