A tile is around 5gb, you can go through 1-2 tiles per minute. They only stream what is needed instead of the entire tile when you go through one.
If they downloaded the entirety of every tile as you went through them you’d need 5-600gb of storage for every hour of playtime (assuming you don’t fly the same route all the time) and you’d also need the internet speed to keep downloading 500gb per hour (1.1gbit!)
No the point was politicians using xenophobia to get support for themselves, and they accidentally went too far and managed to leave the EU while doing it.