I don't really know if this is only to disturb patrons (or potential ones?), guess there could be reasons other than this. Maybe some 'institutions' might have a growing interest in the financial situation of some creators there, and it's all too easy for those to make an educated guess. Talking about taxes here.
But yes, you have got a point. It's not that those switching to the new 'milestone' overview are criminals. So if you asked them they could reply, if they wanted. It's nothing indecent or illegal after all, and they can give you an explanation.
Stay consequent, if you like. But please tell them
why you are stopping your pledges (because they failed to answer you). It's only fair to let them know about it.
I consider pledging something
intentional, one does like the work of others and does want to support the effort. There should be an open discussion about all things of interest among those involved. I don't know yet what I will do, but I will definitely ask them about their reasons for the change, too.