Scam!!!
The billing process is pure scam! You can easily subscribe for a free trial, but in order to cancel the subscription you have to access through the desktop version of the website (i.e. you can’t do it from the app or the mobile version of the website). I cancelled the subscription on the website few days before renewal; apparently it worked, but suspiciously they didn’t send me a confirmation email: indeed few days later they charged me the annual subscription fee! Luckily Apple allowed me to contest the charge and I got a quick refund, but please be aware of the scam mechanism behind subscription cancellation.