Google appeared to remove nearly 100,000 negative reviews for the Robinhood app after outraged investors bombarded the stock-trading startup with complaints. Amateur traders urged each other online to leave negative reviews for the app in the Google Play Store after Robinhood froze trading on shares of GameStop and other stocks whose prices have exploded this week. The campaign appeared to work — Robinhood’s Android app had a one-star rating based on nearly 275,000 reviews on Thursday, according to a screenshot captured by 9to5Google. But that number had fallen to just over 176,000 by midday Friday as Google apparently purged the...