Venture capitalist Peter Thiel says Uber is the most "ethically challenged" company in Silicon Valley.
"We do not invest in Uber. ... We do not look at it," the co-founder of PayPal and Palantir said on CNBC's "Squawk Box" in a wide ranging interview Wednesday.
When asked why he didn't invest in Uber, Thiel said he "missed the boat early on" and now the ride-sharing company's valuation has gotten "too high for our liking."
Thiel, who invests in Uber competitor Lyft, questioned the intensity of Uber's competitiveness.
"There's always a question, you know, how intensely you're allowed to compete, and Uber is right on the line," Thiel said.
Uber did not immediately respond to a CNBC request for comment.
—By Hailey Lee, for CNBC.com