These are static IP proxies, so they will not be changing unless they move hosts. There are more professional proxy services out there that do change often, but these aren't on the list.
The ones above are popular free proxies accessed via a webpage and there are 100% definately not any ISPs in that list. I've been running it for a week now and so far nothing has come in from any non-banned users on our support system reporting a problem accessing the forum.
Fair enough the above are only a handful, but if you can remove the free proxies from the access list then you've removed quite an amount of abuse surely. Only those that use the more professional or paid proxies (or ones not currently on the list) are going to get access. You'll probably never remove all, but some is better than none.
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