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It's not a ball, it's just a wheel, that spins with high speed.
So it stabilizes the boat.
You have the same effect on a bycicle: If the wheels spin slowly, the bycicle will tip over.
If you drive fast enough, the bycicle is stable.
Most Gyroscopes have modi. where you can lock each axle.
E.g. nice, if you have a pan on a stove or meal in a pot and nothing spills out with every wave.
Gyro ON: There goes my fantasy.