Supposing that one company's cash-value offer is equivalent to what it would cost to build, there would be no point in building a startup. That value estimate

Supposing that one company's cash-value offer is equivalent to what it would cost to build, there would be no point in building a startup. That value estimate is what the built thing plus company staff plus brand recognition plus timing is worth. Hardly the same thing as what it would cost to build again. Especially now knowing an effective UI/UX for the task.