SMS Backup+ removed, how to find out why?

I noticed that the app "SMS Backup+" has been removed from the store. Its metadata is still there:

https://gitlab.com/fdroid/fdroiddata/blob/master/metadata/com.zegoggles.smssync.txt

What is the usual way to find out why an app has been removed and when? Shouldn't such information end up in the metadata as well?