When creating a new app on https://developers.google.com/mobile/add?platform=android&cntapi=gcm, I got the following to check or uncheck:
Share your Google Mobile Developer Services data with Google to help improve Google's products and services. This includes sharing with Google technical support, account specialists, and anonymous data for benchmarking. If you disable this option, data can still flow to other Google products that are explicitly added.
Unfortunately I accidentally checked the field/allowed sharing.
How can I disable/disallow it now after project is already created? Does anybody know how to do that?