True that. As @South Park has pointed out below: "The only strategy that works on games that are completely luck based are money management strategies". I totally agree with this.
It depends on what meaning to invest in the word "works". If it's about making a profit (as most people mean when they talk about gambling strategies) then money management doesn't work. If it's about increasing the time of playing sessions or about avoiding the rapid loss of the entire deposit, then it works. And of course money management works in the sense that it is used to set a maximum gambling budget for example for a month/week in order to avoid uncontrollable losses.
That's right, and that's exactly what gambling should be used for: for entertainment and relaxation. Sports betting and poker, for instance, is almost like a job for some people. They are making money with it, but for relaxation they need some other activities. But slots, spinning slots can't be your job. If it is, you should go see a doctor.
So, slots, as they are purely luck-based, can't have any working strategies, with the exception of those helping you to not spend on your entertainment more than can actually afford.