Hola… good point!
As far I know, the Glide’s backend is built on Firebase/Firestore so, the Glide Tables are Firebase tables indirectly. Anyone can access Firebase databases via API using a Key but we depend on Glide’s rules, restrictions and security reasons to get that API Key.
This post created by @Zancoper time ago shows how to connect a Firebase database and put its data into a Google Sheet in an “easy way”:
Import data from Firebase to Glide
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Saludos!