(Reuters) -Elon Musk said on Tuesday Twitter Inc might charge a “slight” fee for commercial and government users, part of the billionaire entrepreneur’s push to grow revenue which has lagged behind larger rivals like Meta Platforms Inc’s Facebook. “Twitter will always be free for casual users, but maybe a slight cost for commercial/government users,” Musk said in a tweet. “Some revenue is better than none!” he added in another tweet. Twitter declined to comment when contacted by Reuters. Last week, Reuters reported that Musk told banks he would develop new ways to monetize tweets and crack dow…