How many of those have a population of 333 million?
The EU (449 million)?
But EU election is not as consequential as national election in the individual states of EU, right?
The point was whether it's possible at such a large scale.
Counting methods that work for a population of 60 millions will work for a population of 300 millions. It's not like counting votes is a O(N²) problem.
When you have ballots that have multiple questions on it and different amounts for each state, it scales linearly.