The explanation of how the crate works has some legal jargon, which leads to some confusion, especially for those whose first language isn’t English. I’ll try to explain how it works as clearly as possible.
To open the first custom crate, you must begin your subscription with valid payment details. You are not charged anything until 1 week has passed. After that 1 week has passed, your paid subscription begins at $20 every four weeks. This is charged to the payment method you chose automatically with no further confirmation.
Immediately once you begin the subscription, you may open your one free crate. Once finished, you are free to cancel the subscription at any point (This is done via the Google Play store on Android or the Apple equivalent on iOS). If you cancel your subscription before the 1-week free trial is finished, you will not be charged at all for anything and you will keep the one custom crate you opened.
You will not need to enter any account details to play the game after the free trial. The only time you enter your information is when you begin the subscription by starting the free 1-week period.
The crate is for any player, not just VIP players. If you do not wish to spend any money, make sure that you cancel the subscription within 1 week of starting the free trial.