Several mentions by victims that transfer limits seem to have been raised:
https://mothership.sg/2022/01/ocbc-scam-victims/
To me the more worrying failure on the part of the bank is that even when they called their hotline or showed up in person, the bank was not helping the victims as the scammers were busy doing their work.
This part is also concerning:
"Natalie (not her real name), 27, who works in the tech industry, said she was scammed of S$43,000 and
another S$7,000 that was borrowed by the scammers using OCBC’s EasiCredit scheme."