If it constitutes significantly less than 20% of their revenue, it's not a "hose that pours money out". So no, Google has not yet found a second hose, even if they've found other revenue streams.
That $36B doesn't come from a single source. Google Cloud is their single largest non-ad revenue stream, at $3.4B in Q3 (or 7.4% of total revenue). The rest of their non-advertising revenue ($5.5B, or 11.8% of total revenue) is lumped into the "other" category, which implies that they have a lot of smaller revenue streams that add up to a larger figure—not a single hose. So I guess you could maybe call Google Cloud a "hose" at ~$14B per year, but it certainly doesn't print money like their advertising business, and is a relatively small source of revenue for such a large company.
