You don't need to be dependent on trillion dollar time companies to get an extremely accurate time source. Just get your own GPS receiver that supports timing output. You can get an GPS-based NTP server for pretty cheap.
I've had an inexpensive GPS antenna "puck" on my roof attached to a 2nd or 3rd gen raspberry pi inside, providing accurate time to my home for over a decade. This is a sub-$100 project and very fun.