I 100% agree with you. What is the point of claiming using Open Source if at the end all data are gathered at Google. I mean a huge part of crypto currencies are saying that they are anonymous but that's not true. If GA is installed on the website of the wallet or trade exchange platform, Google know that this user has an account there. And this is only the minimum we think they can grab. They technically can go further with Google Analytics such as any information displayed on the browser, like the amount you hold and the wallet address.