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The problem is that the proof is in the pudding. Some of their claims feel outlandish. Imagine writing your game with SQL queries. Rather than crafting update packets that only contain relevant game info you just do `select * from players where abs(player.x - current_player.x) + abs(player.y - current_player.y) + abs(player.z - current_player.z) < 100^2` and it just updates automagically 60 times a second.
Running physics sim in SQL stored functions sounds insane but that's exactly what they're advertising. They say it's due to in-mem DB optimization but I'm not sure how they horizontally scale that (they allow you to run standalone but any scaling requires their cloud product)