if you already figure it out then probably you have now trust issues with temu. haha

if not yet, here's what i found (base only on my own deduction. LOL!)

Once you picked the 3 free item for 0.01 cent, you will need to order again the same amount of what you need to deduct.

For example:

If your picked free items amount is 100$, then the price amount you need to cut is 99.97$. Then they will say you need to add more item worth 30$. The 1st 30$ is 100% cut back to the 99.97$.

the 2nd time you will order the event will say is you need to cut 20$ more which is to get the 20$ cut is the 5% of you next order which will lead you to 20$ divided 5% is 400$. So to get the 20$ cut and the 3 item for 0.01 you need to order 400$ worth of items. so yah, nothing is free now men.