I would bet my money that there's a dozen lawyers at work, right now, in Meta's HQ, to get a sense of what options they have to harass, shut down, or do something else to the creator of this app. And I would also bet that Zuck is furious about it.
I can't claim to know more than you; but I think I know enough about corporate america and Meta and Zuck that the idea of multiple lawyers, instead of just one, is at least plausible.
You'd be surprised. They banned Christopher Wylie from Facebook. People routinely report their entire team (building some product for Facebook) getting their accounts banned
Zuckerberg takes things personally. It's his entire history
Somewhere deep in the central European woods, a lonely dev fights for his life, against a dead man switch. Accidentally, a NATO drone flattened his house into glass a week ago. Now, he evades drones, rabid lawyers, train accidents, Starlink honey traps, sudden internet blackouts of unknown origin, regular honey traps, poisoned whiskey, social media bans and dowvotes ...
... if you can find him, you can hire him, and restore privacy and sanity to your apps. he is ... the ZuckOff dev.-