Yes. Every new account gets 3 days free, no card needed. The trial starts on the first device you sign in from.

No. Your plan is tied to your account. Sign in inside the app and it activates on its own.

Yes. An account is active on one device at a time, and the trial can be claimed once per device.

In crypto, through Cryptomus (USDT, BTC, ETH and others). The plan activates once the payment is confirmed, usually within minutes.