Sounds like Daniel Suarez' novel Daemon. TL,DR: Programmer dies but his program manipulates the world after his death, then the US government spreads word that

Sounds like Daniel Suarez' novel Daemon. TL,DR: Programmer dies but his program manipulates the world after his death, then the US government spreads word that the program is a hoax, so later in the novel most people disbelieve that such a program can even exist (because the government "disproved" it!), hindering any chance that society would even believe that something like this existed, let alone was possible. I just wanted to throw it out there to illustrate the parallels of the plot in the novel with the current things happening right now...