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.
I think slots and craps strategies are just luck the strategy you can apply to slots is to try not to lose too much money and know when you might get lucky to raise the bet a little, because when you win on slots, the bet multiplies to a significant amount.
Crap, for me, is almost addictive, but you still have to manage your money very well, otherwise you'll waste it, and if you use a trick, you'll lose it faster than you can. It's happened to me.