You probably did the FL driveout with Alamo. This is one of the major philosophical differences that Sixt ran into when they came to the US. We are a huge country, with sparse regional train service, a lot of leisure demand for cross country drives, demands for a consistently good customer experience, and expectations of a rewards system. Europe is more compact, has viable long distance trains, most people pick up the car at the airport or urban center, want to return the car to where they picked it up, and are used to laws that limit earning and redeeming travel rewards.
Sixt's model of independent franchises with a small footprint works well in Europe and elsewhere, but they belatedly discovered they need a large corporate presence to try to attract American customers. At first Sixt grew quickly by franchising key one-way markets, and to Rent a Wreck type of owners who were not interested in offering a premium experience. Sixt still has not recovered from these challenges to its business model, which is why their US expansion is proceeding much more slowly here than in the beginning.