The attacker was released from prison in March after serving an eight-year term.
Several victims have reportedly lost more than S$175,000 to the online betting syndicate.
Netizens warned against tossing the animal back into the sea.
Netizens said otters were usually more than a match for monitor lizards.
He was in Singapore for a crypto event.
All 15 vehicles used in the illegal operations have since been impounded.
She was sentenced to nine months in prison.
One of the cakes even contained a hidden cash surprise of about S$160.
She kept on making excuses for not being able to meet him, demanding money from him each time.
While Singapore has a stake in Singtel via Temasek, "we do not direct commercial matters," he said.