Free proxy sites to unblock sites

[Proxy Site List]

Yes, proxies can be exceptionally stable and they're usually faster than the free ones.  They are vastly superior to the free ones when they work.  Looking at the failure modes, however:
The free ones resolve backwards to something with "proxy" in it or "proxyprovider" like http://proxysitelist.net/. so they can be blocked en masse.  They're also in a block of IP addresses, they're scattered throughout the world one at a time.  If one gets blocked, the bot gets disconnected, notices it's disconnected and exits.  The Director launches it with a new proxy or Free proxy sites