What bugs him isn't that the endeavor failed, it's that a similar concept — the online education platform Udemy — launched that same year and went on to IPO at a $4 billion valuation in 2021. "I assume they had more resources, better developers, of course, luck,," Cohen says, emphasizing that he's not bitter about it. The main lesson he took from the experience is that sometimes the difference between success and failure is not the idea but the ability to execute. Cohen's entrepreneurial