I have been looking for a reliable source of public proxies and in the process I noticed there are a few services that advertise list of proxies that they scrape. I have a few questions and hope someone with experience can shed some light in them. 1. Where do all these proxies come from? Why would anyone deliberately set up a proxy server on their server/machine? 2. How do these scraping services find them? 3. What is your choice of proxy provider/list when it comes to scraping google results? Thanks!