Well, someone could use your code if it is BSD and charge as much as he wants.
He could use your code with the only requirement to add you to the credits. He also could modify the license, provided that he respects the due credit.
You can't say: "Now my code is GPL!!", the code that this person is using continues being BSD. You gave it away, your DMCA complaint is invalid.
Stop whining and learn about the basics of licensing first. Then focus on your product and not on what other people do. You could also charge for it while giving your code.
He could use your code with the only requirement to add you to the credits. He also could modify the license, provided that he respects the due credit.
You can't say: "Now my code is GPL!!", the code that this person is using continues being BSD. You gave it away, your DMCA complaint is invalid.
Stop whining and learn about the basics of licensing first. Then focus on your product and not on what other people do. You could also charge for it while giving your code.