Regardless of whether or not you provide your own SSL certificates, cloudflare still uses their own between their servers and client browsers. So any SSL encrypted traffic is unencrypted at their end before being re-encrypted with your certificate. How can such an entity be trusted?
Well yeah, it’s not easy. Which is why they limit what they do to the aggregated data or to targeted discovery.
But that’s only a small technical hurdle and the speed with which you can analyze the data grows much faster than the volume (especially if you are smart about what data you analyze and how you do it) so it won’t last forever.
In 10 years, we’ve made such slow progress on conquering that “small technical hurdle” that it’s hard to take the argument seriously.
Generative AI data ingestion techniques are the first round of technology that come close to being able to target the data volume/complexity we’d see in it, and those ingestion techniques are still:
And the techniques that pull data from them don’t end up saying more than what you could have gotten from a directed observation. You need to know what you’re looking for to get it, or you’d need to code particular ingestion techniques to be able to extract the patterns you wanted to scan for.
So, the end result is still the same: Your concern is over a directed attempt to wiretap you, and if that is your concern, then there are a bunch of other places you need to be concerned with.
Also, if your primary concern is the number of people/agencies that might be trying to wiretap you, then I’d probably agree that Cloudflare is not for you. Maybe some sort of Tor connection via an array of cellular antennae?