Hmm, for most it is not really "set and forget". It could be that if you have a credit limit of at least 70K, but I'm guessing most won't.
If you have a large credit limit and you go for the full 35K points each month for the next 74 months (Sep '21 included), then your $35K you PayAll each month will overlap with the next PayAll for 35K to be paid the next month before the direct debit to pay it back executes and clears to restore the available credit back again. This means you will more than likely at some point need a minimum 70K credit limit on your card to cover the few days when you will be carrying the 35K debt from the previous month as well as the 35K new debt in the current month. This means it will require some manual intervention along the way if you're not to suffer some payment defaults. Just be wary of that if you're doing this. It is very probably not set and forget, but much more like 'set and keep a very close eye on'