Do I understand this right that the Visualization API is basically a free API can also retrieve Sheets data as read-only. Then I am confused why the Sheets API doesn't cross-promote this API when you just want to read sheet data for an app. Sheets API requires OAuth or Service Account access and inevitably also charges for usage of the API via a key. Seems like a loophole here and trying to understand why the duplicate APIs exists. I am worried is the Visualization API heavily throttled for users, is adding the mapsApiKey going to give me the same throughput as the Sheets API.
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