Excellent observation!

Apparently, this method of earning easy money from completely naive users, such as starting to sell something that can be downloaded in the public domain on GitHub or similar repositories, is really thriving. But such scammers still need to take into account that users who are really interested in some codes, who actually use them for their intended purpose, are still not such stupid idiots as not to know about the possibility of using open source programs. So it is unclear what makes scammers strain so much and catch losers who will send them money. After all, it is unlikely that even one such naive person can be found.