Supercharger network is also much better than the other networks in Europe as well in the current state.
Yeah, but there it doesn't matter. You can take your €15k Dacia Spring there and use the Tesla chargers :-)
It's true, but the cost is much higher. Normally I see folks using another vendor nearby in the same parking lot as as the Supercharger as they can get a better rate. In the future I think the other vendors will catch up unless some EV bubble bursts.
Of course, the US and China are the biggest global markets accounting for need and purchasing power. Europe has 400M more people than the US, but not the need for cars like the countries mentioned.