The alternative may well have been a dead VP, or worse, so be happy that these channels exist(ed). With that whole department axed we are now in much more dangerous territory. That said I'm pretty sure that Elon Musk knows which side his bread is buttered on and that given an appropriately worded request Twitter will comply just like it did in the past. Or do you think they'll give the FBI the finger now?
Next time you receive a request from the police that you think is reasonable try stonewalling them and see what happens. I guarantee you won't like it.
And as far as the secrecy is concerned: records were kept, that's why you are reading about this.
And these are just the big ones. They've pushed for back doors into iPhones for instance.
I don't care how trustworthy anyone thinks they are. No one should be able to just arbitrarily transcend the law because they are "clean".