[deepakjc]

Ah, this is a helpful insight. I didn't realise that this is how the integration works. It seems that, at most, Google could force Slack to update their integration's behaviour (and take down the integration till that happens). But as you mentioned, they can't really fix it themselves.

I probably wouldn't have posted this if I had received this explanation from Google. :)

This was their response: "Hi! We've decided that the issue you reported is not severe enough for us to track it as a security bug: when someone with access to a doc sends a link over slack, they express their intent to share this document, hence the preview shared independently from the sharing setup on the doc does not represent a significant risk."