Long before guests found themselves abruptly kicked out of their "Sonder by Marriott" stays this month, Sonder, the Airbnb rival, was battling sloppy accounting, a litany of lawsuits, and a stock price so low it was nearly delisted from the Nasdaq. Bankruptcy filings and SEC records show just how stark the signs were - and raise questions about why Marriott, the world's biggest hotel chain, got into bed with the one-time unicorn. The San Francisco startup, founded in 2014, leased apartments and hotel rooms in bulk, redesigned them with a minimalist aesthetic, and rented them to travelers.