It isn’t very obviously documented, but soupslurpr has said this is because it is too difficult to maintain. I’ve considered forking and trying to maintain the database myself, but I am not yet very knowledgeable in Kotlin or the finer details of Android, so I wouldn’t be able to do anything more complicated than maintaining simple hashes and simple fixes.
It can still be used to compare with other people, or with other versions of an APK. (ie, if the APK is published on a developer-owned website and GitHub, I can compare them to each other to lessen the trust of a single server).
I see, thanks for the explanation!