If you want to get from the Bay Area to Lake Tahoe area ski resorts it's almost impossible to do that via mass transit. Best case scenario would be an all-day ordeal with at least 5 transfers, and no easy way to carry bulky, heavy ski equipment. No one is going to put up with that when they can just drive their personal vehicle in half the time with greater comfort.

There used to be a private ski bus charter service on weekends but that shut down due to the pandemic.