It's impressive but if Google Images doesn't do it yet, it's almost certainly more to do with the realities of corporate policy, and scaling up & deploying it at GI scale than as a small toy demo on a static set of a few hundred million (as opposed to countless trillions of adversarially changing images). It's certainly not for lack of good NNs. Remember, Google has much better NNs than CLIP already! ALIGN was over half a year ago, and they have MUM and "Pathways" already superseding that.

As always, "the future is already here, it's just unevenly distributed"; it's just practical realities about lag - same way that the RNN machine translation models were massively better for years before Google Translate could afford to switch away from its old n-grams approach, or the speech transcription NNs were great long before they ever showed up on Google YouTube auto-captions, or BERT was kicking ass in NLP long before it became a major signal in Google Search, etc.