That does seem somewhat of a rational response. It doesn't really make sense because pirates would provably use free burner/throwaway accounts.
The thing is, it probably comes down to an architecrural flaw on Deezers part that they think would cost more to fix than the actual losses due to piracy.
But I just wonder if Deezer could run into legal trouble because of this... I can't imagine that the artists/labels would want their music available like that but maybe Deezer is "too big to be held accountable" as well?
There are github repos that show how to crack spotifies DRM as well. I don't think it really matters or that any one cares. People pay for spotify because its super convenient in a way that pirated music isn't.
I don't know how it works or how to do it, but I know that it is possible to rip music from the Deezer music streaming service in lossless quality.
It's crazy that this hasn't been patched yet because it has been a thing now for a couple of years.