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

Try signing in with any other Yahoo accounts you might have used in the past. If you're unsure of the account you used for your Fantasy League, try to locate it using our Sign-in Helper. If you registered for a Fantasy League using a third-party email address, you'll need to enter the full email address into the sign-in screen. Sign in to Yahoo Fantasy: From Yahoo Fantasy, click Sign In. Enter your Yahoo ID and... Source: almost 3 years ago

Leaguesafe with Majority Approval, Fantrax Treasurer, and Yahoo Private Cash leagues are the safest ways to collect and distribute fantasy league dues. Source: almost 3 years ago