It's official, "Farrell has also sided with ride-share companies in opposing Proposition L" to fund Muni:
He is alone among the 5 major mayoral candidates to actively oppose L, and stands against the Sierra Club, Nancy Pelosi, Scott Wiener, 10 of 11 supervisors, and a whole bunch of other people and orgs: https://fundthebus.com/endorsements
Another reason to rank all 4 other candidates and vote #anyoneButFarrell