I don't think it's a waste of time, it's bringing to the table a potential future that we need to begin to digest as a society immediately. Star Trek, for example, showed us an "obvious future" in which humanity was perfectly united, and then drew the scope in - what would your average office (or, naval vessel I guess) look like in this world? How would the people interact?
(I say obvious future because I don't see a future in which humanity has spread amongst the stars happening before it unites across cultural lines)
So this story says: "One day, we will have to deal with someone making a multi-purpose AI. This is one of the scenarios it might happen in - secretly, and for profit. Here's some speculation about how that would go down. How do you feel about this? What are the sort of preparations you think society should make, if this were to happen?"
If the only step is "AI happens," that's not nearly so bad or infeasible as "FTL happens" or "Time Travel happens."
I guess I am very stuck on your line "as science fiction, it's kind of a waste of time." How else can we imagine and design our futures but through things that don't currently exist (fiction)? Our entire world is literally science fiction in the eyes of Jules Verne - flying vehicles, submarines, traveling to the moon, etc.