You proposed the initial analogy, so I was responding to that. Determining which appeals/email/campaigns are most effective is pretty trivial with open source

You proposed the initial analogy, so I was responding to that. Determining which appeals/email/campaigns are most effective is pretty trivial with open source tools, you don't need Google for this. Honestly part of the reason Google analytics is so successful is not because it's much better than anything else, it's because it's the de facto standard, and free, and people don't see an advantage to using anything else. The advantage to using something else (ideally self hosted, or at least that you're paying for) should be clear to a privacy advocate.