https://en.wikipedia.org/wiki/Nasubi#Denpa_Sh%C5%8Dnen_teki_...
Twitter bot to retweet and follow evetything that mentioned a contest... won a thousand contests.
Of course, this scales badly. The more people who take your service the less valuable it will be as the odds of winning will decrease. Perhaps the natural balancing point would be somewhere where you could still profit. Might be best to charge nothing but take a cut of the winnings. That way people wouldn't be discouraged from joining by the diminishing likelihood of winning, and the chances that someone from your pool would win would only increase over time.
Like with plenty of such ideas, the answer is to do it anyway - scale it until it breaks, making sure you're always making profit yourself, and then call it a day. Enjoy your money and do something else. A while later people will forget, and someone else will do the same thing.
(The real answer is, of course, to not do this at all, because it's unethical. But that consideration doesn't stop everyone, unfortunately.)
Not only naked man starts profiting at 0 day meanwhile skilled engineer needs to develop his tools
but then also automation just makes things faster, so what if quantity of "tasks" is limited?
Wow, that sounds extreme.
But then again I remember there was a contest in San Diego where the participants had to stay 15 hours a day on a roller-coaster and many suffered lasting bodily injuries.
https://en.wikipedia.org/wiki/Giant_Dipper_(Belmont_Park)#Ev...
https://abcnews.go.com/GMA/jury-rules-radio-station-jennifer...
But the time invested is not small. One of the regular customers did the stuff until she had a child: A baby takes up a lot of the time and mental energy that she previously used for coupons. I think she had months of supplies stocked up before giving birth, though.
Her garage is stocked with such things as laundry detergent, deodorant, various cleaners etc which she sells on Facebook and Craigslist. It does involve a decent amount of time, but she has it organized with folders and does the couponing purchases while shopping normally.