First of all, hardly anyone cares (default email signatures etc.pp even if the people don't want that - but you said legally bindign, and I think that just usually never happens.).
And second, at least in Germany it's also somewhat of a bullshit situation that 80% of the people who do a "normal" Computer Science degree don't have that (Diplom-Informatiker/M.Sc), but the 20% who happen to study at a certain uni in a certain degree (that is mostly related, but not the default Computer Science/Software Engineering one) are/were getting their "Diplom-Ingenieur".
And second, at least in Germany it's also somewhat of a bullshit situation that 80% of the people who do a "normal" Computer Science degree don't have that (Diplom-Informatiker/M.Sc), but the 20% who happen to study at a certain uni in a certain degree (that is mostly related, but not the default Computer Science/Software Engineering one) are/were getting their "Diplom-Ingenieur".