They even have a portal that publishes this information specifically, with statistics, and many notes as to why a specific change has been made: https://udd.debian.org/patches
Sorry to clarify, I mean in a way that’s easily parseable. I’m not pulling down source files of every dev installed on my system to inspect raw .patch files and take the time to understand the differences.
You seem to be assuming malice in an innocent question though, that’s on you.
This is utter FUD, of course they do, it is an open source distribution. Everything can be found from packages.debian.org