This tax season, some Americans will get the chance to try out an idea that has been pitched for decades — a free online tax-preparation platform to submit returns directly to the Internal Revenue Service. Though free filing options have always existed, most Americans buy software or hire a preparer to do the job.The new Direct File program is the Biden administration’s big gamble to shake up this practice by establishing a free competitor to behemoths like Intuit’s TurboTax and H&R Block.But Di...