What needs explaining?
Basically the strongest and largest meta went on -/-, that's what happened. There's literally no other in that specific group to come close to that size.
Anglosphere, Baltics and CZ/SK don't even come close to the amount of members native .ru and .it metas have combined this year.
It's nothing surprising when there's only a selected few domains that come in such sizes.
Thanks for the explanation. I am ignorant about anything that happens outside hispanic servers