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Europe's a big place. I don't think I've ever seen one in a residential home here in Portugal, nor in the parts of Spain I know.

True, I generalized, they're very popular in France

I don't remember seeing them in Germany

Do they have them on the apartment doors, or just in the main building door like in Budapest? If the latter, it doesn't really replace Lockitron.

It depends, mostly on the main building door

But there are models that are made to go on an apartment door/main door.

However, they don't usually replace the whole lock, but are there for authorized people to go during business hours

Yeah, not really a replacement for Lockitron