Humans are stupid...
Allow me to explain...
Transportation services such as Uber, Lyft, or taxi cabs, when used to transport single passengers, naturally and inherently increase road congestion.
That claim will mystify the thick.
It's because they need to drive from somewhere else to get to your location to pick you up. Their paid mileage is only about 50% of their total mileage. They're driving roughly twice the distance as would be driven by personal vehicles.
It's perfectly expected that congestion would increase by a ratio not much different than two if everyone used Uber instead of their own vehicle. Your own vehicle is quietly parked in your driveway, and the distance efficiency is pretty close to 100%. Your car doesn't wander off empty searching for its next paying fare.
Humans are stupid because hardly anyone could figure out this rather obvious factor in advance. Uber riders don't see the extra mileage, so they don't think about it. And Uber certainly isn't going to go around highlighting the roughly double mileage ratio.
Yes, yes, yes... There are other pros and cons. Parking is a good benefit. But stopping locations out front would be required. Anyway, the subject here is road congestion.
The fact is that the reasonable first approximation is that congestion would be increased in the direction of two with an increase in Uber, Lyft, and taxi cabs.
In some areas, directionality may reduce the doubling effect. But within the downtown core, this counter balancing secondary consideration would not have any significant effect.
Same rough doubling happens to fuel usage, CO2, etc.
Now that your brain has hoisted aboard this obvious factor, you'll be forced to see the truth in the post title.
Cue the Uber paid social media squad idiotic rebuttals.