I don't know who the provider is, but the attack was almost certainly not targeting the provider, but a site hosted on their platform. Many hosting companies upsell their customers into stuff like providing Cloudflare DDoS prevention. The target site was probably something political or controversial. I work at a hosting provider and we deal with this type of thing constantly.
> The target site was probably something political or controversial.
Since this is Cloudflare, my headcanon is that it was a rival DDOS service, after a wild flamewar on some .ru hacker forum.