SF roommate searches rely on Facebook groups and Craigslist with no way to verify if someone is sane to live with

You need a roommate for your 2BR in the Sunset ($1,600/person). You post in 'SF Housing, Subtlets & Roommates' on Facebook. You get 40 messages. Each person sends 2-3 sentences about themselves. You have no way to verify employment, rental history, lifestyle habits, cleanliness, or whether they have ever been evicted. You invite 5 strangers to your apartment for 15-minute interviews. You pick the person who seemed nicest in a 15-minute conversation. You sign a lease together. Three months later they stop paying rent, bring their partner to live in the living room, and you discover they were evicted from their last place. So what? In SF, where the median 1BR is $3,200, most people under 35 need roommates. You are making a $20-40K annual financial commitment (your share of rent) with a person you vetted for 15 minutes based on vibes. There is no rental history check for roommates (only landlords can run these), no way to contact previous roommates for references, and no platform that verifies the basic facts someone claims about themselves. The entire roommate matching process has less verification than a Tinder date. Why does this persist in the first place? Roommate platforms (SpareRoom, Roomi) exist but are just listing boards — they verify nothing. Running a credit/background check on a potential roommate requires their SSN and consent, which is awkward to ask for before you even know if you like each other. Facebook groups have zero verification. The person who scammed 3 previous roommates looks identical to a genuine person in a Facebook message.