The people he's telling to grind are those that have millions in funding. So you work hard, pay yourself, and if it fails you had a great job and a great experi

The people he's telling to grind are those that have millions in funding. So you work hard, pay yourself, and if it fails you had a great job and a great experience, and you can go get a better job than you could have when you started. Sure, you worked harder than someone who has a boring 9-5, but you're not turning yourself an indentured servant until the end of time. Your only risk is the additional time/effort.