Calling it a bug is misleading.
I'm not saying this is what happened, but without actually knowing what happened we can't assume the intention was to exclude everything in this list forever either.
Glad they changed their mind anyway.
I don't know how anyone can describe this as a "bug", because as the linked article describes, there's an explicit "ContentFilterExclusionList" in the Info.plist file with a list of the specific Apple services excluded. That's not by accident, it's by design.
Coding a feature and providing a configuration file thereto is not a bug.
"The bugs were related to Apple deprecating network kernel extensions (NKEs) in Big Sur and introducing a new system called Network Extension Framework, and Apple engineers not having enough time to iron out all the bugs before the Big Sur launch last fall."