This year’s mostly virtual version of the Sundance Film Festival can’t possibly live up to the heady atmosphere that regulars expect. Sundance, and the deal-making that comes with it, thrives on the in-person experience of crowded lobbies and bars along historic Main Street in Park City, Utah, between and after screenings. But, perhaps counterintuitively, some attendees — tuning in to the film premieres digitally because of the pandemic — still see Sundance 2021 as a major opportunity. Just ask the executives from Shout! Factory, the Los Angeles-based independent film distributor. Buying a hot title at Sundance for the first time could represent a significant step for the 18-year-old company that made a name for itself selling “Mystery Science Theater 3000" DVDs.