If there's demand for their service I don't see why it wouldn't scale. Get more phones, more SIM cards, and have automation around all this infrastructure to automate away as much of the stuff as possible.

> Meta/Instagram have multiple teams dedicated to preventing this type of scraping

That's great but ultimately they still have a weakness: they want people to be able to see their stuff - at least some of it - without logging in. As long as you can either simulate a normal device perfectly, or even better, use real devices or virtualize them, there isn't much that Facebook can do without impacting legitimate usage which they don't want.