If you manage many accounts and hit the same sites often, public addresses from open lists hit captchas and bans fastest. A closed pool with SOCKS5 and HTTP keeps the load steady. So the scraper gets through the whole list, people choose private addresses with spare threads. Where to start: Proxy for Silver bullet Addresses come from all over the world and traffic is unlimited. The list refreshes every 15 minutes and comes as a link. For Proxy for GSA the addresses go straight to work.