I have not looked at this for a while, but when I did, I did a search for "anonymous proxies", "free proxies", "web proxy servers" and so on. There are (or used to be) sites that listed between dozens and hundreds each (OK with duplicates of course )

I think that the real problem is that this is a moving target, and the information rapidly gets out of date?

Perhaps if you gave a better idea of operating systems browsers etc. and explained exactly what kind of activity/sites you were trying to block, someone might come up with a clever way of doing it.

Even if you block 80 or 90% of the sites, someone with a little patience will find one in Guatemala or wherever, that you have never even heard of, and you are compromised.

As I said, I can see what you are trying to do, but I doubt if it is practical? Your requirement is too specialised

1. No-one will do it commercially, because there are not enough fee paying customers?
2. No-one will do it for free, because it is not a threat to the internet community as a whole?

If you explain your worst fears, we might be able to come up with an alternative?

Cheers