Far from the palm trees of Miami or Austin’s taco trucks‚ Catalin Voss has headquartered his literacy start-up between a cannabis club and pawn shop in the heart of the Mission District. Voss rents a nondescript office building in one of San Francisco’s most vibrant neighborhoods as a home base for Ello‚ a company he co-founded in 2020 that uses speech recognition technology‚ powered by artificial intelligence‚ to help struggling students develop their reading skills. The office is...