It's not laziness, it's opportunity cost. For SpiderOak, it makes sense to spend a few weeks of a few developers' time to roll their own analytics. For me, it doesn't. Our customers aren't privacy-focussed. In fact, our app depends on them explicitly sharing [quite a lot of very personal] data with us. I would rather spend that time building something that delivers value to them and us than indulging my personal beliefs about privacy.