In an interview published by Forbes tax advisor Goulder explains the history of international exchange of financial (personal) data between governments. It ends with this question:

So what is the future of this? Where are we going with this giant world of tax information exchange?

Goulder answers that the genie back cannot be put back in the bottle:

There’s no way the governments of the world are going to go back to that. So sorry, taxpayers: That’s just how it is. People didn’t like it. People wanted to fight about it. Once the U.S. had FATCA, there’s no way the rest of the world wasn’t going to try to mimic that in their own ways, and they did. So I think for the rest of the human race, for time immemorial, we’re going to be talking about automated information exchange. There’s no going back, Dave.

So we must hope that those governments do not only think about their own pockets but also respect the fundamental rights of citizens.