That's an interesting way to look at it. If I understand Apple's position, it's that Facebook can't deny functionality based on privacy settings. But it's less clear to me whether they're prohibited from offering something of actual value. Like if Facebook had a point system—"Facebucks"?—where users could buy stickers/apps in exchange for targeted ads, I wonder if Apple would permit that.

That, I honestly wouldn't have an issue with. If people choose to sell their privacy for something they actually want, that's up to them. It's the shady coercive crap that I despise.