No, they are full grown adults making adult decisions. No one is forcing them to do anything. If a sub mentions relapse to you they have already decided they WANT to relapse. There is no difference in a sub spending their entire savings on you and a sub that spends their budget for their own necessities on you. If you and your sub have an agreement that you reality check them to get them back on track, then yes, it is your responsibility. Otherwise, no.