Similarly, if Google have billions in the bank, they can easily offer the Google Maps API free to all and kill any competing service (that took years to develop

Similarly, if Google have billions in the bank, they can easily offer the Google Maps API free to all and kill any competing service (that took years to develop and lots of money to build). Once all the competitors have gone bankrupted or pivoted to find a source of revenue, Google can simply jack up the price of the API and cash in. Sure, Google loses developers' trust with this behavior in the long term, but it has worked so far for the monopoly so... ¯\_(ツ)_/¯