A TechCrunch article[0] suggests that all of this information was just scraped from the Instagram site/API, so is it fair to call this "sensitive" data if it's available to the public anyway?
It is actually, if you go to instagram's website and view source, there's a script tag containing a massive JSON payload with the response from their graphql API which contains allllll the data for the page - this includes some information that's not displayed on the page, which sometimes includes email address and phone number. I had to scrape instagram for a school project and stumbled upon this - I was planning to parse the html but if you just take out that script tag as a JSON object you have all the page's data in an object for you already.
[0]: https://techcrunch.com/2019/05/20/instagram-influencer-celeb...