I have been to the Author's website and do not see any mention of Ads. Nor do I see anything about a paid version. The Author seems to be an aspiring programmer for hire so he may just use the Ad revenue to get by. I can't see the mere pence he receives from those Ads feeding his cat much less his family.
I as well Arctos. The Ads do not generate that much money for the Authors and always become intrusive. I installed the app just to give it a look and only played with it for a short time. The only Ad I saw was a little banner at the bottom which took you to his other apps. Did you encounter any Ads Mate?