Based on these events... I would call it not proven yet

028559d218

The main value of these types of shitcoins that do have a privacy angle is that of a proof of concept. Tech that is not proven can be on them before being considered for bitcoin.

Zcash does a rapid fork because of an "issue identified through a routine audit"

Scoresby

Yep. 

The main value of these types of shitcoins that do have a privacy angle is that of a proof of concept. Tech that is not proven can be on them before being considered for bitcoin.