It might be related to this [2015] but that was a hoax. https://news.ycombinator.com/item?id=9374028

No, it was something else but I can't find it via HN search anymore. I think it was in 2013-2014, which is timeframe when I deleted my FB account (that for some reason kept living for many years as I was told).

	▲	jazzyjackson 3 days ago \| parent [-]
		Onavo VPN maybe? 2018 Onavo Protect, the VPN client from the data-security app maker acquired by Facebook back in 2013, has now popped up in the Facebook iOS app itself, under the banner “Protect” in the navigation menu. Clicking through on “Protect” will redirect Facebook users to the “Onavo Protect – VPN Security” app’s listing on the App Store. https://techcrunch.com/2018/02/12/facebook-starts-pushing-it...