Europe is not using Facebook or Instagram, it runs on WhatsApp. In some big Western European countries WhatsApp is the monopoly messenger for a lot of people (SMS/MMS always was overpriced so people looked for an alternative, and it came about with the Android mass market in the early 2010s). If Facebook would WhatsApp a truly good product (remove telemetry, charge for use, extreme control like in Threema) they might even still have a viable product for our market here. They already got the users. Carrier billing in particular might make this a move that's easier than many think.