It is not a pooled tip. I asked the Bliss concierge about this when I was adding our tips to our account. We never travel with a lot of cash, and we like to pay for as much as we can by credit card, so we add tips to our onboard account. The concierge actually needs the person’s full name and department so they can add the tip to the correct crew member’s account. The night butler had been delivering hot tea every morning at 5:30 AM, but my husband never caught his name. The concierge was able to look him up so we could tip him. The concierge said the day butlers do not need to “tip out” to the night butler.