More than one church asks for tithes. I don't know that even the LDS (MORMONS) actually asks to see tax returns. I believe that most such churches are operating on an 'honor system". I think the WT could do that, but I don't see that they are,so it will be interesting to see what transpires, certainly.
So far as this new system-it is just tightening the financial noose. The thing is-they say that it will not be "enforced" and that brothers should not be hounded for it. We shall see how THAT transpires, also. It is also said that each year, according to circumstances, that they could/should re-evaluate the amount that is pledged. Reality will soon kick in, hopefully. And again, it will be interesting to see what THEN transpires:)