There is no reason why social media bots would be in a single Yandex datacenter. They would be easy to ban. Either decentralise for small VPSs around the world. Or use infected fridges.
It is probably easier to centralize the command and control infrastructure and AI comment generation in a few places and use proxies for posting. The bots are not independently operating, they are puppets.
The bots may still depend on resources provided by Yandex, eg by using their AI services to compose messages. API goes down, bots fail to generate text, botspam disappears.