Revenue was down 14% year-on-year, to $137 million, in the second quarter of 2023, following a decrease in website traffic, Trivago reported. Meanwhile, revenue for Expedia, which opted to use Google’s new ad unit, reported a record second quarter with revenue up 6%. Drop in ad spend. In its Q2 results, Trivago announced that its U.S. ad spend had decreased by 10% to $32.9 million, and 4% in Europe, year on year. Trivago addressed its Q2 results in a statement published on its website:"We observed increased volatility in the results of our performance marketing campaigns.