Its true that Europe doesn't have the market, but this also not the reason. The real reason is that when Ariane 6 started they were competing against 2014 Falco

Its true that Europe doesn't have the market, but this also not the reason. The real reason is that when Ariane 6 started they were competing against 2014 Falcon 9. And they designed a rocket to potentially beat Falcon 9 in 2014 and also still do the job of Ariane 5. The design of Ariane 6 quite literally was to 'win commercial launches'. Europe always knew they don't have enough launches, so they need to win other launches. Of course they have now adopted the solution of simply paying Amazon money so they launch on European rockets. So not only is the rocket insanely expensive, they are so desperate to get launches they are paying the US to pull ahead even further in space, while Europe stays backwards while still spending lots of money. This is literally a slow moving disaster of policy we have observed over the last 15 years (arguably longer).