The product you're referring to seems to be the licensed version of Tenorshare 4uKey, which includes an email and registration code. This implies that the user has purchased a legitimate license to use the software.
Yes, the official trial lets you scan and detect your device. However, to actually remove the passcode, you must enter a valid licensed email and registration code. Tenorshare 4ukey Licensed Email And Registration Code
Yes. If Tenorshare detects a key being shared online or used on hundreds of computers, they remotely revoke it. That is why “free codes” stop working within days. The product you're referring to seems to be
Pirated software is illegal and can lead to civil or even criminal penalties under laws like the IT Act. to actually remove the passcode