In my own opinion and experience , when you meet someone and you see that they are open to calls at any time (can call each other) video chat , etc, where you can have proof that they are the person they say they are, it could work on the other hand , if the person you meet tells you that video chats are not possible because of phone/ computer issues or they can call you you cant call them or if you do it has to be on a certain time, etc. Are the first indicators that they are trying to scam you. I fell for it and lasted almost a year. These people are getting better every day and learn from our mistake. So to me yes, LDR can work if work is put in by both of you