Yes, we all know that. But the ones that "don't want" to know that are the lawyers and the legal entities. Whatever we scream down here, Mozilla Corporation is the one who will face those legal confrontations, and whatever we agree implicitly here with the softwares won't hold candles to those lawyers and courts without explicit legal wordings.

I agree with you, but it seems that a lot of lawyers do not. Most of the other browsers have the same language in their ToS, as do many programs like Microsoft Office.

Exactly, Mozilla just tries to mislead people that their "web services" are indivisible parts of Firefox, but they're not, for me it's a software running on my computer.

I don’t think that they are trying to mislead at all. At no point do they call Firefox a service. Instead they call Pocket a service, and their VPN a service, and so on.