That has nothing to with them being US companies. Or are there any jurisdictions where Bolt/(other local company) is allowed to freely operate but Uber is banned?
Those are just examples. Whatever the reason for each, sovereign jurisdictions don't allow free access to their resources/markets just out of spite. That includes Europe.
That’s only partially true though. I don’t think Uber itself is not allowed to operate anywhere. Rather it’s business model is illegal in some cities/areas. Usually you can still use Uber to hire actual taxis there.
However exact same rules apply to its European competitors like Bolt. Make it entirely unrelated to this situation.