Those little volatility meters in the game info screen are set by the studio and refer to base play, not to the purchased feature. Plenty of games rated medium become extremely swingy the moment you buy, because the feature concentrates all of the variance into one event. Measured volatility for bought bonuses specifically, based on simulated runs, is what https://thebonusbuyslots.com publishes alongside the official rating, and the two often disagree. I treat the official label as marketing at this point.
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