Isn't the money given by others just legitimate income?

It depends on the specific situation. If the money given to you by the donor is his legal income, the gift is his true expression of meaning, and the process of giving is in line with legal procedures, then the money you receive is legal.

If the money sent to you is his illegal income, it is not your legal income. If the victim is investigated, you have the obligation to return this illegal income to the victim.

Or the legitimate income of the donor is not his true meaning in the process of donation. Originally, he intended to give it to others, but when the bank entered the account number, he mistakenly put the money on your card, so this money is not your legal income, and you have the obligation to return it to yourself.

The donor has obtained legal income and doesn't want to give it to you, but if you force the donor to give it to you through coercion, coercion and other illegal means in the process of donation, then your income is illegal.

Article 665 of the Civil Code of People's Republic of China (PRC) stipulates that if the revocation right holder cancels the gift, he may request the donee to return the donated property.