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I'd say that is either a hustler or a fraud. Hustler noun 1. an enterprising person determined to succeed; go-getter. Definition of fraud in English: noun [MASS NOUN] 1 Wrongful or criminal deception intended to result in financial or personal gain: 'he was convicted of fraud' [COUNT NOUN]: prosecutions for social security frauds ...
Depending on the connotation you'd prefer, consider: irrepressible - not able to be controlled or restrained. G cheat - a person who behaves dishonestly in order to gain an advantage. G
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