I tried the 7 day trial. I received a Google notification on day 7 that they had taken £49.99 from my account which actually happened several days later. I cancelled my subscription and opened a dispute with Google. They've just taken the money and Google haven't helped me. I'm furious. I see that this has happened to other people too. It's clearly a scam. There's no way to contact the developer. If I try the email address given it takes me to a PayPal payment page.