So in short Patreon decided to put a sales tax on some pledges on the 1st of July, it will be small amount added, I will not be losing money from my pledges, it will be added once you will be billed.
As I am from EU and I am supporting a couple of creators here, the amount is small and I've been used to it since the beginning, I definitely know that this is applicable in some US states as well when you are purchasing goods, so it should be similar! So the changes will be barely noticeable!
Although I understand that for some this might not be an option, especially with the current situation that is going on in the world...
For more information please check this article that patreon created:
also if you have any questions please direct them to patreon help desk, as they will be able to explain more on the matter: