@Glenn wrote:

The endless nerfing of GrabPay continues with everyone’s favourite cashback card going down the drain – UOB is changing the T&Cs for the UOB One card to now explicitly exclude Grab mobile wallet topup from 16 March 2020

We just heard about it today, but seems like the news came out 1-2 days ago in the form of an SMS notification:

In addition, if you can also check out the latest UOB One card T&Cs you will also find a new clause indicating that Grab mobile wallet top-up transactions would also be explicitly excluded from the additional 5% cash rebate.

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Screenshot from UOB One card T&Cs as of 15 Feb

With this latest change it appears that the UOB One card is going the way of many other credit cards, in that you can still get rewards if you use