The thing is if you have a custodial with the fund in their it won't ask tell you it's taking it out.  The initial warning mentions "after paying a lightning invoice" but if you have the funds in your wallet it wont show you any invoice it will just create and pay the invoice in the back end.  So you don't even get to approve the payment.  Approval is apparently implied as soon as you click the "open channel and migrate funds" button.    

The user doesn't even know they paid or how much until they go back to their alby cusotidal wallet to see the missing funds and how much it was.

If you don't have the fund they you'll be presented with an invoice to pay which is reasonable because at that point the user is faced with the decision to act and pay the charge.  

Your taking the act of approving the actually payment away without event tell the users how is going to be taken. 

That doesn't feel good.  Feels like something got taken from you without your full approval. 

You feel me?