For a lot of people, Grok is the first AI they got to use through Twitter. Grok does get quite a lot of usage, and isn't out of the game - coding tools aren't the only use case for AI.
this is like saying people still use google glass. sure, some people might but AI-wise it is as dead of a product as it gets
these users are probably losing the company money.
the failure is in converting regular people into actual ai product consumers. Companies are realising that the money is not in regular consumers but in enterprise and they are not considering grok as a serious alternative.
if anything, the name, the branding and the x/twitter affiliation has hurt adoption from money makers rather than help it.
so yes, people know it, but no one is willing to pay for it