This show was so good.
The best thing about it? The show was unapologetic and didn’t try to make Oz into some conflicted villain, or anti-hero. Sure, you have to root for the show’s lead but they achieved that by showing him emotional at times, praising Vic, seemingly showing generosity of spirit in his underdog-against-the-Gotham establishment story. But as the show progressed, we learn he lies about everything and plays everyone against everyone else and none of these moments were truly genuine for the right reasons; they were all part of his manipulation tactics. The show essentially played the audience also as it progressed through the 8 episodes.
Having him and Vic sit alone, triumphant after beating Sophia and just talking it out, only for him to kill Vic, shows that he truly is only out for himself. Which is how it should be - he can’t become one of Batman’s greatest villains and the crime Kingpin of Gotham by being even mildly compassionate. It’s a shocking move that we perhaps didn’t expect, but knowing the character after all these episodes, it’s not that hard to accept that he is capable of this. I don't think he even truly loves his mother, because nothing he did was truly in her best interests - it was all about her opinion of him, and thus his opinion of himself.
There is some irony also that in the end, he kills his most loyal ally - who considers Oz his ‘family’ - by choking him out, just like Carmine Falcone did to all those women. He doesn’t go with a bullet to the back of the head or something else painless, but inflicts a slow death on Vic. He becomes the hangman that Sophia was falsely accused of being.