
Privacy is v imp / no question asked / but how will a restaurant 1) understand you may or may not need e bill and what if u need a e bill , email is a sophisticated layer which restaurants aren't able to instantly verify 2) how will they follow up with u if any emergency occurs ( bag, phone left etc or sometimes guest pays without leaving, not TRC) 3) even small businesses need basic intelligence like no of visit by this customer or their ordered dishes for genuinely improving or helping with order or even working on their menu engineering 4) did the restaurant ever has a history of selling ur data or spamming u ( any past incident) , if not how will they be harmful 5) apart from ur number there is no unique identifier - of course these are daily issues - we need to understand why they ask / no one is asking to accept
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