Not all slot providers or games are created equal. And your betting strategy can make a big difference in how your returns pan out. But if you ask me, I think you maybe mistook being unlucky for a bad provider, getting maliciously bad odds is unlikely unless you were playing on some unknown platform.
It’s more about how lucky you are and what games you are playing. In my opinion, the real question is not what the highest multiplier you’ve ever hit is but how much you’ve won or lost overall!
Hitting low multipliers frequently is practically the same as hitting a high multiplier once in a while. Technically, it depends on the game's volatility. If you have a limited bankroll and want to play for as long as possible then you should stick to low-volatility games with a high RTP.