You want evil? I can give you evil. ASM.js or similar like Webassembly. Use it, create a polymorphic VM in the browser that forces a user to compute the ads in

You want evil? I can give you evil. ASM.js or similar like Webassembly. Use it, create a polymorphic VM in the browser that forces a user to compute the ads in order to get content. Now, trap the content in each VM (and no, not as a downloaded plaintext). This will be an encoded bytestream, that the easiest way to decode will be through the browser VM, and displaying ads along the way. That's evil, and I would highly assume it works.