I spent a little time trying to figure out who/what is behind this thing:
https://replika.ai/about/story
https://www.linkedin.com/in/eugenia-kuyda-638a8a1b/
https://techcrunch.com/2016/04/08/luka-with-4-42-million-in-series-a-releases-ai-powered-chat-bots/
Not sure I understand the commercial potential unless it's to develop 'bots capable of providing basic psychological counseling.
Remember - If it's free, then you are the product...