Does YouTrip have any penalty charges for negative balance?

I also have a negative balance in my YouTrip account. Since there is no penalty charges, I intend to just dispose it and use Revolut instead :)

There aren't any penalty charges for negative balance within your YouTrip wallet. There isn't even any minimum amount to maintain in your YouTrip wallet ever since dormancy fee was removed.
https://support.you.co/hc/en-us/articles/360000...

Since YouTrip works like a prepaid debit Mastercard, card usage might be hindered if you have a negative balance. All card functions should operate as per normal after topping up the negative balance :)