That's because the tech sector is busy actually doing useful stuff and inventing world-changing technologies. Pharma only does some of that (their pace of innovation is quite lackluster, and they spend more on marketing than on R&D, the real medical innovation is being done by other entities), finance is figuring out how to make money from a bad economy with hedge funds, telecoms are just exploiting their monopolies and screwing customers over, and entertainment is just rehashing old stuff with never-ending low-quality remakes, reboots, sequels, and prequels.
Instead of trying to use politics to make more money by screwing people over (which is how other industries mostly work), the tech sector makes money by creating new technologies. It's a fundamentally different mindset.