Unfortunately the "official" taxis at SFO have been reduced to using the prime pick up real estate they've been given to scam people who don't know any better. I tried taking a taxi home from there and they quoted me a price more than double the cost of an Uber. I showed the driver the Uber price and told him I'd be willing to pay a little more than that, but his price was ridiculous. He didn't care and wouldn't budge on the price.
I'd guess this consumer-hostile arrangement is maintained via some kind of kickback up the ladder. It's pretty funny to see a long line of empty, desolate taxis sitting right outside the arrival doors, while if you walk 15 minutes to the far side of the terminal where rideshare has been relegated, it's bustling to the point that it's difficult for drivers and passengers to find each other.
So yeah, my view is you can say what you want about rideshare; taxis are far worse.