Private proxies are helping and used by individuals, marketers, and companies for anonymous surfing on the internet. Private proxies are working as a buffer between you and final destination thus hiding your real IP address.
Private proxies use cases vary from industry to industry, we can spot heavy usage of private proxies by internet marketing companies (from search engine optimization to data scraping).
Private Proxies also have their own place in countries where there is not such a thing as freedom of speech. Where people combine VPN with private proxies to remain 100% anonymous while surfing online.