Ok, let's don't state it as an argument, but rather as a question.
Do anyone that's so much against opt-in is aware of closed source tools that tracks you and use it anyway?
And..
Do you use any third party web service like gmail or any other?
Although I hardly think I'll get an answer from most. At some point you have to make assumptions, wether those are fallacies, ok.
It's true it's not directly related to the functioning of the software, but it improves it in anyway, then there's a connection with it.
I take developer side and I personally look for see the grater good/less harm and compromise.
Opt-in will likely give them very little % of adherence and thus rendering all of this useless. Most of the opt-in advocates have technical capabilities to opt-out in any way (homebrew way, network filters, forking ,etc...). So why not simply letting this go?
I do think homebrew is a rather technical tool so most users are tech savvy guys, but still.
For me, this is pretty similar debate to donating organs.
https://en.wikipedia.org/wiki/Organ_donation#Opt-in_versus_o...
And I am 100% an opt-out advocate!