Interesting.
Looking at the user feedback for Touchpal at the Play Store, I see a number of complaints about obnoxious ads. One recent reply from the developer says:
TouchPal July 25, 2016
Dear user. Thanks for getting in touch. We do sincerely consider about your suggestion. Our appreciation will be shown in later version. Hope you can keep faith in us, we are growing to a better one for you.You can always subscribe to the TouchPal Premium to remove all the ads. I promise you that you will have a splendid typing experience. ^_^.
I'm not sure, but I think "Premium" costs $4.99. Ouch!