As a person who works for a company with 25k people, I would disagree. You, a single person will often get to the basic product that a lot of people will want much faster than a company with 1k, 5k and 25k people.
Bigger companies are constrained by internal processes, piles of existing stuff, and inability to hire at the scale they need and larger required context. Also regulation and all that. Bigger companies are also really slow to adapt, so they would rather let you build the product and then buy out your company with your product and people who build it. They are at at a temporary disadvantage every time the landscape shifts.