No idea what the IP shows up as.

That site effectively acts as a proxy and treats anyone who uses it as if they are from the same IP, which inevitably means someone gets it banned.

TMC (or TMS, one of the two) worked the same way and every time we lifted then ban, within days or weeks, someone would use it to spam and we'd have to ban it again.

If you simply need to get around a work firewall or the like, your fellow players can probably point you to the appropriate technical solution.