I don't think so. American buses are ridiculously outdated, while having to compete with some of the most well-equipped cars in the world. If Europe had such buses, they wouldn't be popular either.
The shitty metro buses in my 3rd rate "city" have air conditioning, wifi, live location tracking to your phone, wheel chair lifts, tap to pay, tap with app to pay, and run on propane because they are old enough to have "features" left over from the last oil crisis.
Can you tell me what a "Not outdated" bus looks like to you?
Europe isn't the richest place. Some of the western cities surely have nice buses, but there are plenty of old shabby buses there too and people still ride them. Might be that the routing and timing sucks, or the general cultural individualism.
But mostly it's a mix of the integration network effects you mention, cost of reimplementation if you want to leave, and the good old "nobody gets fired for buying IBM" dynamic.
It is mostly the freshness. There is a reason it all comes from small local bakeries - it has to be made that morning. Even by the afternoon it will not be as good.
Wild that I could read this article, give DeepSeek about 4 sentences of prompts and have it running on my own homelab and unifi cameras in about 10 minutes.
The future mostly sucks but some parts are pretty cool.