Re: Still no go
If you query via Cloudflare only they can hit you with an optimized CDN endpoint straight away. [...] So there is a very clear self-interest here as well.
Well, sure. So what? They're indirectly monetizing the service by making their core paid-for service more attractive. From my viewpoint as both a consumer and a CloudFlare customer, that is vastly superior to the usual "log forever - mine - resell - repeat" monetization cycle that most internet companies use...
...but that's only the case if CloudFlare is being truthful about their DNS log retention and data usage. They claim to have engaged a firm to conduct annual audits, but who's to say if that means anything? The junk mortgage bonds that precipitated the global housing crisis and financial collapse were audited and rated, too.