Outside North America just about every country I’ve ever lived in or visited had assigned movie ticket seats.

As European, I can tell that it depends on the kind of cinema, and country.

My experience, being discussed in another thread, is that only big commercial multiplex do it, many small cinemas with more alternative content, usually don't do assigned seats, only ticket reservations.

And in some places there are so few movie theaters that, at least on weekends, you have to buy days in advance or you might as well stay home.