alt Hacker NewsBoth "search" and "everything else" are primarily advertising revenue[1], and advertising spend is always heavier in Q4 because of (Black Friday and) Christmas.
[1]: As the page says,
- "Search" means "ads on Google Search and on other Google properties such as Gmail, Maps and Google Play"
- "Everything else" means "YouTube ads, subscriptions and devices, Google Network and Other Bets".
Matches my experience in adtech, Q4 was always at least half of our yearly revenue. Q1 usually came in at less than 1/4 of Q4.