Just ads!
I have the free version and use it very rarely. I just tried to see whats in a particular drink. As soon as I got there in the search it threw me to an ad. I dismissed it to go back to the drink and it bounced me to the ad again. After 3 or 4 rounds of that I closed the app. Safari could have gotten me the info I wanted in less than half the time. Now that Ive written this I can delete the app and find a better one. Or use Safari.
Santa Cruz Joe about
Mixology™ Drink & Cocktail Recipes (Free), v5.0.5