Edward Snowden's take on Allo is “Nope.” Google's decision to back off a previously promised privacy feature for Allo earned it a thumbs-down from the NSA whistleblower, who received asylum from Russia after exposing the NSA's secret domestic surveillance programs. Allo, a personal messaging and assistance app which lacks previously promised security safeguards, amounts to “Google Surveillance,” Snowden tweeted Wednesday. So “Don't use Allo.”