well, as someone who plays both slots and dice, there is definitely no "strategy" for slots, you just spin and hope luck on your side.
for dice it's the same, but there are strategies tho (not really true strategies, more like bankroll management or a betting systems), most popual one would be martingale.
but those "strategies" do not increase your odds, or guarantee you will win, because whatever strategy you use or not use, it won't change the fact that the house edge will catch up to you in the end. imo, it's just a fun way to play, not that ridiculous.
But then you can replace 'slots and dice' with any other type of casino games and say the same. Strategies are a way we use to fool ourselves so we believe our chance increases. Usually, in the end this means we gamble more than we planned. If we simply believe in luck, we know it is about chances. If we believe in STRATEGIES, we play thinking we know better.
Then the casino shows you who knows better.