One could also use it to verify membership (or non-membership) in a set without having access to the set. Suppose I have a secret list of websites from whom yo

One could also use it to verify membership (or non-membership) in a set without having access to the set. Suppose I have a secret list of websites from whom you shouldn't load ads. I can then just publish a bloom filter which you can use in your browser to see if a web request should be allowed or not, without having access to the original list. I know this is contrived, but hopefully you get the idea.