Obs: I'm being sarcastic but since it's either this or developer laziness, I'm betting on tracking since I always start from the principle that the developers analysed the situation and made an explicit choice.
in our case, it's just a wrong decision, we don't use it for tracking.
also, if you use facebook login, the terms and conditions force you to use their SDK (which automatically initialises when included and does this crap).
https://developers.facebook.com/policy/ - 8.2
"Native iOS and Android apps that implement Facebook Login must use our official SDKs for login. "
In terms of the person writing the code, they can certainly push back. Being asked to add the Facebook SDK is either a red flag enough for him/her to do so, or they don't mind. In either case, they've made that choice.
True, you're just facilitating, not profiting.
Such a clear and obvious good reason to drop support and walk away.