I wouldn't use the word 'monster', but I strongly dislike Thiels' opinion that founders should aim to build monopolies. Monopolies are bad for society, but Thiels' view it that monopoly is the only way to build a successful startup.

"I sort of have a single idée fixe that I'm completely obsessed with on the business side which is that if you're starting a company, if you’re the founder, entrepreneur, starting a company you always want to aim for monopoly and you want to always avoid competition" https://youtu.be/5_0dVHMpJlo?t=26s