Connecting accounts to receipt scanning apps question

From previous post recommendations, I am adding Coinout and Receipt Hog (already had Ibotta, Fetch, and Frisbee). I am a little hesitant to link my email or Amazon account but have a good bit on subscribe and save monthly delivery. I know nothing is completely secure, but has anyone had problems after linking any accounts to these apps? Is it worth it?

submitted by /u/Remyandlunasmom
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source https://www.reddit.com/r/beermoney/comments/1j65rs4/connecting_accounts_to_receipt_scanning_apps/