Is seems to me the top five software companies are on a never-ending quest to buy up every other promising software company. GitHub, Twitch, Mojang, Instagram, WhatsApp... I'd love to see a few smaller software companies refuse to get bought up and instead cultivate an independent mindset. Otherwise, we end up with a world completely dominated by Microsoft, Google, Apple, Amazon, and Facebook.
It's unlikely. I suspect many people start businesses with the intention of doing what they love and making a decent living out of it. Then the bigger the company gets, the further removed you are from your original dream and when someone waves a big pile of money in your face, it's a very tempting offer
Also many of the founders have an "entrepreneurial spirit", which really means to me they prefer to start things, make it a success (or not) and then move on, over and over again. They are not often a "lifer" that hang on at the same company till they retire. Some are, many not.