Just an idea, tasks where you watch an ad? That’s the only way I could see this game have ads on mobile.
you could ad ads in between rounds/on the home screen on the side when menu's are up. And even just an ad bar when there is discussion time.
Well the problem with that is an ad might disrupt the actual game... though there could just a gag ad for a task that anyone could get, just a "Coming Soon- Among us 2~ (updates, one day)"
In Among Us 1 the ads are between rounds, but this sometimes gets really annoying for the host