Those resources should not be read as implying that there is any chance GCloud gets "shut down" in 2023 or 2033 or 2043 or anytime before the recognizable end of computing as a business. There are issues, to be sure, but this is not Reader.
Google maintains strategic leadership in infrastructure to efficiently run Ads. The ultimate addressable market in the cloud business is as large or larger than the ads business.
Cloud also is just getting into the middle game, where commodity storage/compute services start to give way to specialized and domain specific storage/compute/analytics/intelligence. Google has unique strengths there, and a number of opportunities/advantages vis a vis Microsoft/AWS.
But rather than dominating in Cloud, Google treats it as a hobby- like TV was for Apple for about a decade. Google can perfectly well continue to treat it like a hobby. They are well ahead technically, and have plenty of cash to maintain that leadership underneath Ads.
Those resources are reporting on the framing that- for the right leaders inside Google, there is an opportunity to turn their infrastructure capabilities from a strategic skillset into a leading business. That's all.
Maybe they will, maybe not. But even if they don't, there will be no "shutting down" on any near term time frame. Even as a hobby Cloud will be big enough to be alive for a long time.