But in general you have to be very careful because the slots are quite addictive and you can make a lot of money with them. Besides, they are usually the most profitable game for casinos.
Coming back to the topic of whether slots are a waste of money, No I don't think so, because slots are more fun in general. I don't know how people find any thrill or fun rolling the dice or dropping plinko balls all day. But when you are playing slots like Wanted, Warrior Graveyard you are always at the edge of the seat when those vs vs vs might drop .
Anyway, it's much better to read and see first if there is a withdrawal requirement before playing on a casino platform to avoid inconveniency and, of course, wasting time. Also, don't rely on the free spins; they're just bait for you to deposit more money.