This is what I’ve been thinking about, too. It gives me a great deal of pause about buying anything from Bliz again; subs, mounts, pets, clothes, toys, anything. I know the game can’t last forever, and - we’re here now. lol 
edit: I’m not entirely buying they can’t verify it, because I think my ‘restoration’ was about 6 or 7 lines of text about grey stuff I put in the bank before the data loss, and never withdrew. Where did it go???