  We audit the presence of domain-level source diversity bias in video search
results. Using a virtual agent-based approach, we compare outputs of four
Western and one non-Western search engines for English and Russian queries. Our
findings highlight that source diversity varies substantially depending on the
language with English queries returning more diverse outputs. We also find
disproportionately high presence of a single platform, YouTube, in top search
outputs for all Western search engines except Google. At the same time, we
observe that Youtube's major competitors such as Vimeo or Dailymotion do not
appear in the sampled Google's video search results. This finding suggests that
Google might be downgrading the results from the main competitors of
Google-owned Youtube and highlights the necessity for further studies focusing
on the presence of own-content bias in Google's search results.
