I got my RM30 free credits through Grab already. Claimed at 9am, approved and credit in at 12pm. Also received RM125 worth of RM5 discount vouchers to use with Grabpay credits. But can only use these vouchers at specific merchants:
1 x JomParking RM5 voucher - minimum spend RM20,
3 x Photobook RM5 voucher - minimum spend RM20,
1 x Hotlink topup RM5 voucher - minimum spend RM10,
1 x Mydin RM5 voucher - minimum spend RM20,
3 x Sushi King RM5 voucher - minimum spend RM20,
3 x Secret Recipe RM5 voucher - minimum spend RM20,
3 x Baskin Robbins RM5 voucher - minimum spend RM20,
6 x GrabFood RM5 vouchers - minimum spend RM25,
3 x Coffee Bean RM5 voucher - minimum spend RM30,
1 x GrabCar ride RM5 off - no minimum spend.

TnG E-wallet still system down from too many people trying to claim. They are giving 6 x RM5 cashback bonus in addition to the RM30 credits from government. However it's not stated how many people will get the cashback bonus. The cashback is more flexible than the vouchers at Grab. Spend minimum RM20 at any merchant signed with TnG and get RM5 cashback to your TnG e-wallet.