English term (edited): to be as legit as pudding

The phrase "legit as pudding" is an idiom or metaphorical expression that is not commonly used in English. It seems to be a creative and playful way of saying that someone or something is considered genuine, authentic, or legitimate.

In the context of the statement you provided, it suggests that when someone achieves success in business, especially if it happens quickly, there is a risk of developing an inflated or exaggerated sense of legitimacy or credibility. The comparison to pudding may be intended to emphasize the idea that success can be fleeting or insubstantial, much like the temporary nature of a pudding.

For this reason, I suggest the translation above.