I think that built-to-flip vs dent-the-universe is a gross oversimplification and a false dichotomy. Maybe they were aiming to change the world, but their funding round wasn't coming together. Or maybe they lost the faith and decided to return money to their investors, rather than go bust. Maybe one of their key team members had a personal or family issue and needed more financial stability in a hurry. Maybe they learned so much about startups that they were wishing for a reset button. Maybe some combination of all of these things and more?

Startups are a repeat game. A base hit might just be the right career move. You can swing for the homerun on your next at-bat.

Having just gone through a small acquisition myself, I can tell you that it's incredibly bittersweet to pad your bank account by means of killing your baby. Unless you've gone through the process, you have no idea the extent and complexity of thought processes and emotions you experience as a founder.