What's the Difference Between Vesting and Investing?

Vesting at the seed stage is typically not that controversial. Where this gets controversial is in later rounds. And as a founder, unless you are a solo founder, if you have co founders, you definitely want to have vesting on your and your co founders stocka. If one of you just decide to leave some point before vesting, then you would walk away with a huge portion of the equity in the company.