The Week in Tech: Silicon Valley's Alternate Reality

Andreessen Horowitz, the venture capital firm, is backing Palmer Luckey's virtual wall start-up at a $1 billion-plus, unicorn valuation. This is the same Palmer Luckey who left Facebook after it was revealed that he was backing right-wing internet trolls and anti-Hillary Clinton meme factories in 2016. Mr. Luckey's surveillance start-up, Anduril, has gone where many Silicon Valley tech workers have refused to go. The start-up, which is also backed by the Palantir co-founders Joe Lonsdale and Peter Thiel, is testing digital cameras and artificial intelligence technology that tracks people crossing the southern border. Tech workers have made clear in recent months that they want no part of similar military and surveillance projects.