It is very likely illegal.

To register an Amazon store, you need your identity information and mobile phone number. Generally speaking, helping others register Amazon accounts will earn you a few thousand yuan, but in fact, the cost of registering an Amazon account is very low, so generally this method of collecting your personal information is not for registering an Amazon account.

In many cases, when you provide personal information to others, if others use your information to commit a crime, you are at risk of being suspected of aiding and abetting a crime, so be careful.