Every week, there is a trend on the internet. Whether it be memes of moths or eating Tide pods, almost everyone is exposed to these short-lived trends. Normally they are harmless, including the Tide pod thing, as long as you didn't swallow the detergent. Sometimes the trends are beneficial, such as the fundraising campaign that was the Ice Bucket Challenge.
a perpetual, irrevocable, nonexclusive, royalty-free, worldwide, fully-paid, transferable, sub-licensable license to use, reproduce, modify, adapt, publish, translate, creative derivative works from, distribute, publicly perform and display your User Content, and any name, username or likeness provided in connection with your User Content in all media formats and channels now known or later developed, without compensation to you.
These images and the permission you give the company provide everything that is needed to train artificial intelligence to create better and more believable fake images and videos. The more you use the app, the more help you could potentially be giving Russian organizations to create these photos and videos.
Just like with the personality quizzes on Facebook that became the basis for the Cambridge Analytica scandal, the problem comes down to users carelessly and willfully giving away their data. Before you use these types of gimmicks, think about the information involved and how it can and will be used by others.