I could be wrong and no doubt will be corrected but I wouldn't have thought many people would use this free offer as most people, bar tourists, in London on a Monday are residents or daily commuters into the city and are using Oyster or a rail ticket with prepaid zones.
Yes, I totally agree. It's a Monday, everyone is at work. I can't see many taking a day off work to travel into London just because the travel is free with ApplePay on that day.
You're right, those that are likely to benefit would already be travelling into London.....and they'll only see the saving if they are a PAYG customer. Those with season tickets aren't going to benefit.