Give a dollar(unprofitable and unsustainable service) for a pennies by burning the money of the investors to capture a market then switch to high profit margin business practices and milk out the captured market thereafter.

Sure, it can be framed as spend money when developing a product then make profit of it when released but the winners are determined by keeping alive the developed product longer than everyone else ane when everyone else is gone, then monetise.

People who spent billions of dollars to run YouTube at loss for years were not philanthropists, they rightfully expect to make that money back and make much more on top of it.