Google Cloud is big enough to be significant in terms of revenue, but AFAIK is only maybe breaking even in terms of profit. If you break up Alphabet into 26 or more different companies, you haven't broken up the monolith into non-problematic small companies 1/26th the size of the original, you've got 25 irrelevant companies and then one subsidiary that gets Ads which is almost as big as the original. Google even says as much in their financial statements, most of those listed companies are listed as 'other bets' and are a tiny fraction of the main line item that represents ads.
Google cloud gotten profitable enough that they only spent $5B to earn $4B in revenue last quarter. After a dozen years that's the best ever (classic case of monopoly leverage to get into a different market).
Advertising is "only" 81% of revenue but almost 100% of profit.
Some other commenters have proposed that properties like YT and Android drive ad traffic but when I looked at the last 10Q it looked like YT was about 10% of ad revenues. I believe Android is a net loss but worth it in that it's an offset to reduce payments to Apple. But I just skimmed the filing because this is just an HN comment.
It would also stop them favouring their own products in search results
Few, if any of those companies would be viable on their own. They require monopoly support. For example Google Cloud loses a billion a quarter (they spent $5B last quarter total in $4B).
As far as the cloud market goes there's really only one player, the profitable, pure play AWS. Everybody else is losing money, and mostly fudging the numbers (Google "cloud" includes Gmail, Google Workspace etc; MS's cloud includes running Windows for big customers, Office 360 etc etc).
Nest is marginally profitable.
Otherwise it's pretty thin gruel.
Perhaps Google Search, Chrome, and the advertising business could be split. Or Google Search could be split into Google Search 1 and Google Search 2.
0: https://www.theverge.com/2020/2/3/21121207/youtube-google-al...
YouTube, Google search, deep mind, Google fiber, waymo, Fitbit etc
Seems pretty easy to break up if you want to.