They don't choose which ads are featured in the game. The ads are all provided by a third party. If you're annoyed by the ads, just buy the game for $5 and support the developers.
By watching the ads OR buying the app, you're still supporting the developers. You think they don't make a massive amount of money on impressions and clickthrus? SMH.
That said, if one particular advertisement is ruining your customer experience, the 1st party AND 3rd party should be upset and remove it, as it's causing a loss of revenue, regardless of buying the app.