Uber CEO investigated over allegations of fraud in price-fixing case
theguardian.com
theguardian.com
I think it's just an alternate play on the contractor vs. employee argument. Since Uber drivers are not employees I guess it's possible that anti-price-fixing statues might somehow apply. I would imagine that if drivers were employees then this line of attack would be bunk.
It's ironic that, if anything, prices are being fixed below market rate, not above it.