To a french ear, it sounds like a (bad) translation from English.

For instance, "a été testée au combat" is meaningless in French. The same idea in idiomatic French would be "a subi l'épreuve du feu". And I guess the "billions" should be only "milliards" (French uses the long scale, so the word "billion" exists but corresponds to a thousand billions as understood in (US?) English)...

I hear you, but it's also a reality that more people in our field have heard "battle tested", know what it means and understand the French translation than "épreuve du feu" (I genuinely only ever read that idiom, and not once since the horrible movie which got that as the French name).

That's where I'm saying going back to an older idiom just makes it classic, and doesn't help communication in itself IMHO.

"testée au combat" is a dumb and lazy translation for "battle-tested". Also, we don't have billions here, it's "milliards". The fact that it comes from a french non-profit organization makes it even worse. Such a lack of respect for their own culture makes me sad.

French culture is more than sticking to old idioms. A language dies when it stops evolving with times.

It's a bad, very literal machine translation. ChatGPT would do a better job.

A billion in French is 10^12 (1,000,000,000,000) so I doubt they truly served "billions de requêtes".

2x10^12 isn't crazy for a number of requests over 3 years.

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.