It's not a scam. According to the inquiry of Watermelon Maker in official website, Watermelon Maker was founded in June 20 17, and has gained millions of users in 60 countries around the world. August 20 19, led by New Oriental Education and Culture Industry Fund, followed by Safran Investment Fund and Oceanwide Investment. It is a listed company that won the B+ round of Tencent's strategic investment in May 2020, so it is a regular company, not a scam.