For any competitor to even make a dent in Craigslist they'd need to expand well beyond SF. Almost three years, and what markets is FOBO in? When you install the app, you get a modal that says "Available Only in San Francisco". It apparently uses geolocation: I can't even look at the app if I'm not in SF.

Also, they need to expand well beyond consumer electronics: on CL I've bought furniture, cars, found freelance work, searched for office space, searched for a home to lease, and more.

FOBO could "win" 100% of personal consumer electronics sales in SF and it's probably would have no effect on CL.