Strategies can work on on card games because even when you are holding a bad card, you can still bluff your way to win and if you know how to count cards, then your chance of winning is higher. In other games you can't do it like in dice games, its really a game of chance, result will be based on what was given to you. Martingale? People think it worked for them but its not, you just feel good because after 2-3 loses, you won on the 4th bet with a higher amount at stake, try to compute, its still the house that wins.
Correction, you should say say "pvp poker games" as you cant do bluff in all card games. Bluffing is not really good strategy if you do not know how to read your opponent. Failed bluff = big lose + embarrassed
Strategy does exist but it works only when you are lucky. It is better to use strategy to minimize loses than just betting without strategy at all unless you are someone who like to use "YOLO".
