It seems you don't actually understand the security measures you mentioned.
Peerguardian (and other tools like it) IS an ipblocker and blocks the dangerous ips and ranges. Exactly what it blocks is up to you based on what list you choose. It would in no way prevent anyone from seeing your ip and doesn't claim to do so either.
Proxies. Eh. Public ones are slow slow slooow, and it would kind of defeat the purpose to use commercial ones anyways. Tor is relatively fast, but I'm not sure how secure it is.
Private sites could easily be infiltrated. And probably have.
It's probably just not as pronounced as when there are obvious fake files on public trackers.
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