A billion in French is 10^12 (1,000,000,000,000) so I doubt they truly served "billions de requêtes".
For comparison Cloudflare deals with 32 million requests per second[0]. I don't know if they're at CF scale, but in itself it's still a plausible number for a multinational DNS.
[0] https://blog.cloudflare.com/application-security/
PS: mistaking the short scale for the longer is common, but that shouldn't be a pretext to straight throw every use of "billion" under the bus.
For comparison Cloudflare deals with 32 million requests per second[0]. I don't know if they're at CF scale, but in itself it's still a plausible number for a multinational DNS.
[0] https://blog.cloudflare.com/application-security/
PS: mistaking the short scale for the longer is common, but that shouldn't be a pretext to straight throw every use of "billion" under the bus.