“Pulling a Facebook.” Recent moves by Google have some technical experts worrying the company is, inch by inch, selling out the trust it has built with users in favor of revenues. Among the transgressions: linking people’s Chrome browsers to their Google accounts by default, striking a secret deal with Mastercard for people’s credit card data, and exploring a censorship-friendly web browser for China. Matthew Green, an assistant professor at Johns Hopkins University who teaches cryptography, wrote a column for Slate explaining why he is turning his back on Google products.