Be wary if a company avoids Google. For example Tinder started forcing users to subscribe directly instead of using Google. This is because most people cancel almost immediately since once you subscribe you find all your matches are bots.
The entire purpose is to make it just hard enough so you think ohh it's only 10$ a month. Another trick is to offer a month free. Hulu does this. If you cancel on their website you get several pages which try to convince you to stay.
Google also makes it easy to manage all your subscriptions in one place. What is all this crap I'm paying for, I can quickly see what and delete it. Also I'm much more likely to try a service ( I'm studying Chinese right now and have used various apps) if I can do it via Google Play .