Avatar Face Customization System?

Hey guys, I have been creating a mobile game and I really wanted to have an avatar face creation/customization system in the game so players can each make their unique avatars. I’ve seen lots of apps recently that all use a very similar style of avatars (trivia royale as an example and they all look like memojis). I was wondering if they all made their own avatar system independently that just all happened to look pretty much the same, or is there some avatar face customization SDK or asset that all of these companies are using. As a quick follow up question, if I were to make my own avatar face customization system, how would I go about doing it? Thanks guys!

Dont post the same question in multiple forums, it breaks the rules. I answered your question in the other thread.