On Monday, it announced on Facebook it was also pulling out of Singapore where the company is based due to strict rules imposed by the country's Land Transport Authority.
Since it shut down in Melbourne, many Victorian users have been unable to get their $69 deposit back after noticing that the option to request a refund through the app had disappeared.
oBike also appears to have disconnected its Australian customer service number and shut down email accounts, despite still operating in Sydney.
Have you been affected? Email firstname.lastname@example.org.
While the company isn't responding to requests for refunds, it is still promoting deals for Australian customers on its Facebook page.
A post on Tuesday offering free membership for riders who park in designated spots immediately attracted comments from existing users demanding their deposit back and warning others not to hand over any money.
"They ceased operations in Singapore and not paying back the deposits. You may be next... Beware Obike Australia!!!" one Facebook user commented.
While dockless bicycle schemes have proved popular in countries such as China, they've struggled in Australia due to helmet laws, vandalism of equipment and complaints about bikes being left in the wrong places.
oBike's Australian representative has been contacted for comment.