As far as I know, the USA is fairly unique* in that they allow tax deductions for donations to churches. Where I live, you only get tax deductions if you donate to a properly registered charity that actually does charitable stuff, not simply for donations to the church you attend. So references to the WT's charitable status don't really resonate here.
Churches might have a side gig, like a food bank, that does have tax deductible status. Maybe the WT has something similar, like an emergency relief fund to which JWs can donate, but I can't see them emphasising something like that over donations directly meant for Bethel to use however it likes.
* Well, it's certainly different from here. I haven't looked into at length. I am aware that some European countries do stuff like the Norway thing which was pulled out from under the WT. Not sure if that's the same thing, though.