Google can shut down any service at any time — as it has done with Google+, Stadia, Inbox, and others — and when it does, any data you have stored exclusively in that service may be permanently deleted.
Google's Terms of Service apply to every product in its ecosystem — Search, Gmail, YouTube, Maps, and more — and by using these services you grant Google a broad license to use your content globally, including after you stop using the service if others have already reshared it. Google can suspend or terminate your account and remove your content at its discretion if it determines you have violated its policies, with limited advance notice in urgent cases, which poses a real risk if you rely on Google services for business or personal communications. You can export a copy of your data and manage your content permissions at any time via Google Takeout at takeout.google.com or review and delete specific content in your Google Account dashboard at myaccount.google.com.