I'm more talking about the fact that, if there were a new Instagram or WhatsApp for VR that threatened their social media hegemony, Meta would most certainly be blocked from acquiring it. Especially because it seems the current FTC regrets that previous FTC administrations green-lit the WhatsApp and Instagram acquisitions.
The Within case isn't informative, IMO -- Within wasn't building social media applications. It was more a case of an acquihire. The VR ecosystem is too early to have an Instagram/WhatsApp moment, yet.