Their largest business is largely mobile ads in mobile games, as I understand it, and has been for a while. As a business, they haven't really competed all that directly with Unreal for AA/AAA games. If you like ads in mobile games, root away! > https://unity.com/products/unity-ads. - Source: Hacker News / about 1 year ago

The SLOWLY app mobile version packages include libraries to connect and use different ad services companies. With this version, I see a lot of ads provided by Unity Ads - which is popular both in iOS and Android markets. Source: over 2 years ago

Here is my product: https://matchkraft.com/. It is a marketing toolkit. I think you need to ask for feedback, asking why users don't want to pay for a premium subscription. So far, you are getting new users that is a good sign you are going to the right direction. Maybe, who is your ideal customer or maybe your product is ok but need more visibility (maybe paying ads). Try to get active users. I really want to... Source: about 1 year ago

Calling a 3rd party API: There is a complete ecosystem providing "google-sheets-as-DB". I personally tested and recommend https://sheetson.com/ but there are a lot more with free tiers https://sheetsu.com/ https://sheety.co/. Source: about 2 years ago