However, google is still a third party and I would argue this is not legal, as is using google maps or other external entities known to employ excessive tracking unless you have special data protection contracts with said entity.

But I also understand the law, that anonymous user statistics are just fine and don't need consent as long as you retain the data yourself and of course mention it in your privacy policy. Though you might still be obligated to respect "do not track" and adding an opt-out setting.