From the Google monopoly court ruling of August 5, 2024.  They found degrading their search result quality by "two Wikipedias" reduced revenues by less than 1%.
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<br /><a href='https://www.texasattorneygeneral.gov/sites/default/files/images/press/Google%20Search%20Engine%20Monopoly%20Ruling.pdf'>https://www.texasattorneygeneral.gov/sites/default/files/images/press/Google%20Search%20Engine%20Monopoly%20Ruling.pdf</a><p><a href='posts/202505/post-20250512-005351-a.PNG'><img src='posts/202505/post-20250512-005351-a.PNG' loading='lazy' /></a></p>