Unless it's TT, certain remittance service transfers with a different the account holder name attached.

Examples tested (by forumer):
i. Instarem -> USD IB US (failed)
ii. Instarem -> EUR IB Germany (OK)

Or some might have faster and/or cheaper way to transfer to their SG account first.

Or some change regularly but keeps the cash as warchest in their SG account (gaining some interest), ready to deploy.