Good point. People (like me as well) are easily confused by he term "strategy" as i never really thought that even unproductive strategy, that is doomed to fail and based on gambler's fallacy is still considered as a strategy. But i recon that in sports there are more ways to implement different strategies, as you can do ton of research about the players and teams. I am not saying that they work, but they might have better changes working then using it with house edge games. And i would say they can give way higher edge then just playing with low odds.
And obviously those strategies can work in poker. Only proof i need for that is the fact there's often same groups of people ending up in last tables in poker tournaments.
As for me I already know how this strategies works and since also I am aware that there is not working strategy anywhere that can guarantee a steady winning or any winning at all unless based on luck this make me to have clear and better understanding of what the ops mean when he mentioned strategy, and what wasted efforts it is if you depends on such a strategy to win any bet at all, most of the people that make such statement are all doing so because of they own benefits since if you ask to see such strategy they may ask you for a few and when you pay, you likely to lose but the money you pay for the strategy and even your betting money as well, so is of no use having such a strategy or using such strategy to bet since ithe strategy doesn't work.
I actually do think that the worst mistake anyone can make in gambling is paying for a strategy, when winning in gambling is absolutely luck dependent, although it depends on the type of game being played though, like for example, in card games where skill is required to win the game, then strategy must be present too, and the one with the best strategy will always win, like when it comes to games like poker and blackjack, I believe this games are not totally luck dependent, but winning also depends on one's skills, and skills often go hand in hand with strategy.
So, if a strategy is being sold for games like poker and blackjack, then it's still a bit good, but on the other hand, I guess another question would be, what is the seller still goes ahead to sell same strategy to other gamblers as well, which i sure trust he or she will as long as it's money we are talking about, this also will completely destroy the whole strategy, so, in the end, we still discover that its a very foolish decision to pay for strategy to win games, be it luck dependent games or skill or knowledge dependent games, for luck dependent game has no other strategy of winning aside luck, and this i believe is also same for knowledge based games as well.