By Tobias Carroll Benjamin Franklin famously said that the only things that are certain in life are death and taxes. Then again, Benjamin Franklin did not live in the era of online trading and cryptocurrency. If he had, he might have been tempted to add a third item to his list — namely, the near-certainty of Warren Buffett being incredibly unimpressed by the next big thing in finance. Last year, Buffett made his disdain for Robinhood and other online stock trading apps apparent. This year, it’s Bitcoin’s turn. During this year’s annual Berkshire Hathaway shareholder meeting, which has often p…