Earlier quoted context omitted.
Your calculation is completely off. 150 min * 0.15 $/min = $22.50. In the US you can get a kWh for about 12 cents. That means you can get 187.5 kWh. The largest Tesla Model S has a 100 kWh. I don't know what kind of battery these scooters have, but I am sure it's not nearly as big as a Tesla battery.
The electricity costs aren't the problem, the big cost here is paying people to collect the scooters up and charge them. As the article points out the cost of electricity makes up such a tiny amount of this cost that it's not even worth calculating.
It costs $1 to 'unlock' and $0.15/minute after that. So a $5 payment requires: 1 unlock $1 and $4.00@0.15/min = 26.7 minutes of "usage" (note, not ride, usage, the 0.15 is paid per minute that a user has the scooter "unlocked") before the $5 "finders fee" is repaid by one scooter and one rider.
The numbers shift of course if the same scooter is "unlocked" by plural individuals during the day, due to the $1 unlock fee. Five usages of a few minutes each for a single scooter in a single day repays the $5 "finders fee" just with the $1 unlock fees alone.