When Spin n Gos first came out, professional poker players generally mourned about it and said, the format could not be beat. However some then went on and grinded a lot of them proving, that this was wrong. Presumably even this game format has matured over time, but it would be weird, if at least the lowest stakes were not still beatable, when the format has such a huge appeal to recreational players.
That being said its not a format, that has ever really appealed to me. Because they are so fast, you end up paying a lot of rake per hour, and its not easy to find huge skill edges, when you only start with 25 or 30BB, and blinds then also go up every 3 minutes. Plus if you grind these for profit you also have to overcome the extra variance added by the fact, that some of the price money goes into the largest multipliers, that you will likely never see.
So for me personally I would rather play something else. However I certainly dont think, these games are rigged, as OP seem to assume. This is just a silly idea, which we see repeated again and again by people looking for external reasons, why they dont win in poker.