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 / over 2 years ago

You could technically make this in illustrator, but the actual program you’d need to be using for the whole thing is something like Adobe InDesign, or Affinity Publisher. Source: over 1 year ago

Affinity Publisher might be worth a look. Source: over 1 year ago

I use Affinity Publisher, as it is the direct competitor of Adobe InDesign. It's a one-time purchase and has all the features InDesign has for as far as I've used it so far. Only the spreadsheet handling is a little wierd. Fingers crossed they update that system. Source: almost 2 years ago

There's always Affinity Publisher. https://affinity.serif.com/en-gb/publisher/. - Source: Hacker News / almost 2 years ago

There are professional layout tools like Indesign or Affinity Publisher. The latter is very affordable and comes without a subscription. Source: almost 2 years ago