Well, one thing I am personally sure of is that, gambling is not trading, and can never be like trading, strategies work well in trading, in such a way that if at the end, the trade did not end in profit, the trader has the liberty to investigate his or her strategy to ascertain where exactly the mistake which caused the loss came from, but in gambling, there is no known or official strategy, what most of us assume to be a gambling strategy is not a strategy in real sense, but more like an assist, for example, many gambler mistake martingale to be a gambling strategy, but in real sense, it's not a strategy but an assist, martingale can assist a gambler to win more money, but does not add a single percentage to the gambler's chances of winning the bet in the first place.
Lets not re-invent words. Strategy is a broad term and could be roughly described as plan of action. As such martingale is a gambling strategy, because you'd be betting in a specific pattern (the plan). It's also widely described as a betting strategy, so I have no clue what are trying to achieve by attempting to change well established definitions.
Also, a strategy doesn't mean something good. There are a lot of bad strategies out there, martingale being one of them, and I think everyone in this thread knows that it is unlikely to help you win more money.