I'd start here:

https://en.wikipedia.org/wiki/Grok_(chatbot)#Controversies_a...

And here:

https://en.wikipedia.org/wiki/Grok_sexual_deepfake_scandal

I think polarizing is a generous way of describing the problems. My organization has outright banned Grok, because we don't trust SpaceX to hold up to contractual agreements vis-a-vis data-privacy/training. That's the level of reputational damage we're talking about here; and we use Chinese models (*hosted by US providers) for context.