The difference between (free) Gmail and Google workspace is that workspace is a paid product. If you're big enough to warrant an AM, you can get terms which include continuity of business planning if Google does happen to shut down Workspace. (They won't.)
Is your argument that Workspace is a paid product and therefore won’t be shut down? If yes, let’s keep in mind that Stadia was paid-for too. My trust in the longevity of Google products has been damaged beyond repair.