Push Notifications, Edit Profile, Photos Of view, Post Promote, Comment Moderation, Lead Gen Ads, SMS Captcha...and that was in February. They are ramping up their usage all the time.
They are gradually transitioning their code base to RN. Instagram has been in production for quite a few years now, it can't be an easy task to rewrite everything in RN. I think the above examples are significant, and they claim in the article that it's working well for them, so I expect them to continue to expand usage of it.
Push Notifications, Edit Profile, Photos Of view, Post Promote, Comment Moderation, Lead Gen Ads, SMS Captcha...and that was in February. They are ramping up their usage all the time.