Why is that a problem? If you are the type of person that is paranoid about anonymous usage data you will be very well versed in opting out of things because that's pretty much the standard. Homebrew is even notifying users that they are starting analytics and that you can opt-out. Here's what I just got on my terminal:

   ==> Homebrew has enabled anonymous aggregate user behaviour analytics
   Read the analytics documentation (and how to opt-out) here:
     https://git.io/brew-analytics 

The vast majority of users want Homebrew to work better and are fine with the developers knowing which packages are the most popular. This is not "betrayal".