Despite the recent attention on digital privacy, venture capital investors have mostly stayed away from companies that offer virtual private networks, which allow users to hide their online tracks. Now there is one big exception. AnchorFree, the maker of Hotspot Shield, one of the oldest VPN apps, said Wednesday that it had raised $295 million. The round brings AnchorFree’s total funding to $358 million, far outpacing any of its competitors. The Redwood City company is the latest tech startup to secure a giant investment. Fundraising rounds of more than $100 million have become more commonplace than ever this year.