Grok has to be more than n-times (2x?) as good as anything else on the market to attain any sort of lead. Falling short of that, people will simply choose alternatives out of brand preference.
This might be the first case of a company having difficulty selling its product, even if it's a superior product, due to its leader being disliked. I'm not aware of any other instances of this.
Maybe if Musk switches to selling B2B and to the US government...
If you piss off half of your possible user base, adoption becomes incredibly difficult. This is why tech and business leaders should stay out of politics.