[petercooper]

I have an analogy.

Why would a zebra have evolved to have black and white stripes? You could see a zebra from miles away due to how it stands out! Yet.. when it's in a herd of zebra, it's hard to pick any individual one out, and that's why the pattern works.

And so it goes with using services like Slack, Gmail, S3, etc. My account on its own may not be the most secure thing ever but it's hidden in such a large pool of data - much of it far more valuable than mine - that the safety of the herd becomes relevant.