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Poker. Game of skill. Looks like gambling from the outside. Rich people use it as a way to socialize while wasting money. Not dependent on any technology. Has existed for hundreds of years (Lindy).

Practice enough to win at an average table and then know at any time you can get on a plane for Vegas, Atlantic City, or another place with consistent games and make a living playing cards.

Perfect as a backup plan / hedge. Poker also teaches lots of life skills so still useful if you never really use it too.