Yeah it's a nice information here though, there could be some guys who usually want to hack a persons account but for the sake of otp they will send it to the Gmail of the original sender and claiming they are from the casino sothat you will somehow be manipulated to send them the otp for them to use it against you. So surely the rate of cyber crime and fraud is becoming high and alarming, this implies that we need to be careful they way we accept and confirm messages on Gmail to avoid given access to scammers.alway double and triple check to be very sure to be safe. Perhaps the lessons of other is enough for others to learn.