A regulated(licensed) exchanger is someone who invested a lot of money to get. Also, the gov knows about that company and it has a bond from it if something bad is happening.
A financial licensed company has yearly audit and all the information is public. The director is not a shell one, etc...
Once you are using an unlicensed company you should not complain on forums that you were scammed by X or Y exchanger.
What is the impact of this illegal things for us the users? What question is that?

Of course, it has a lot of impact if you encourage illegal financial companies to activate.
Hence, I asked. What would this illegality brings us? Would it mean Xapo has a greater tendency to scamming us? Or selling some of our information to public? What I'd like to point out is, does this fact brings so many negative impact upon us? And is it better to leave Xapo as soon as possible or would it still worth staying (because their free service is nice)?