How does VKontakte manage to do without CloudFlare?

Question

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Today I spent half a day trying to figure out which CDN and AntiDDos service VKontakte uses, but the result of my searches remained equivalent to the beginning - complete zero. I did not find the slightest trace of "CloudFlare", "QRATOR", "Amazon AWS" and other services in this direction.
How does VKontakte do it?

Answer 1

something like this + the FSB will not allow traffic to be allowed through abroad, what kind of Cloudflare is there?

Answer 2

Vkontakte can afford its own security service and any hardware.

Answer 3

Vkontakte has 90 million daily visitors.
The largest ddos ​​attack in history was carried out using a botnet of over 150,000 devices.
Incommensurable scale