Your description of the game is vague and you don't give any card examples. Check out the cards against humanity website and you'll see that they give lots of card examples up front. I'm not clear if you wrote the cards yourself. As a player, I want to know that the game will be fun before I play it. Source: about 3 years ago

Just in case you still don’t know: If you wanna play with a real set, you can buy any set of Cards Against Humanity cards. There’s a lot of different extensions. You could also print a free PDF set of cards they have on their site, Https://cardsagainsthumanity.com. Source: over 3 years ago

The problem of scale for profitability from ads is certainly there. You could look to use something like admob to start with to make some money back (although the earnings likely will not cover with cost of marketing, without scale). Source: over 1 year ago

1. AdMob Google is the No 1 player in the mobile advertising market. It was already the largest online advertising company when it acquired AdMob. AdMob makes earning revenue easy with in-app ads, actionable insights, and powerful, easy-to-use tools that grow mobile apps. - Source: dev.to / almost 2 years ago

Use online services, such as Google AdMob, for filtering and sorting in-app ads. Source: over 2 years ago

There are different ways to monetize with your Flutter app. You can make users pay to download it, you can have in-app purchase plans, you can let users subscribe using recurring payments to use all the features, or you can show ads to your users. In this article, Dhruv Nakum teaches you how to integrate AdMob into your app. - Source: dev.to / almost 3 years ago