It was actually a mistake. They were removed years ago specifically for the fdroid builds, but were reintroduced at some point on accident. Annoying mistake for sure
If the app is hosted at its own F-Droid repository, devs can add whatever they want. I wouldn't be surprised if that build is the exact same one as the Play Store one.
Nevertheless, good step for users! I wonder how devs will get crash reports and such stuff now, though...