Wait, there's a lot in the obvious features.

But security and privacy are not really guaranteed. (Unless you are a person capable of performing an audit yourself.) Presumably those who need security and privacy would need the guarantee. So I was wondering outside of those two, are there other compelling features Tox could be marketing?

I understood it that features that are not guaranteed via audit are features other than security and privacy. And features outside of features that are not guaranteed via audit are two features - security and privacy.