Oh, absolutely. I assume people who play exclusively gacha games do so due to the combination of F2P, regular content updates and excitement from pulling for characters/gambling but that's just a personal guess. I don't have any hard data to confirm it.

As for folks playing them regardless of genre, that's not really exclusive to gacha games - there's plenty of people who play whatever catches their attention, myself included. Strategy, racing, shooters, adventure games... if it clicks with me I'll play anything (gacha or not). There's too much fun stuff out there to limit yourself to a single genre, in my opinion.