If you are using Hola VPN you are now part of a botnet

Hola, one of the most popular online services for viewing blocked videos and TV shows from other countries, has turned its users into a botnet without their knowledge. The software, which is available as plugin for the Chrome browser on desktop and mobile devices, had previously been praised for offering an easy-to-use and free service. However, it seems the company has been discreetly selling users’ “idle resources” (i.e. their bandwidth) via a separate Luminati brand, allowing anyone to buy traffic in bulk and redirect it to a target site as a denial-of-service attack. Essentially, Hola’s users have been unwitting mercenaries in a botnet-for-hire.

source: Popular Chrome extension Hola sold users' bandwidth for botnets - The Verge