You would think Apple, the company that makes the platform which enables all this, would be held accountable too. But people turn a blind eye to their false claims of a secure platform.
iOS is massive. Operating systems are massive, from an attack-surface perspective. NSO is hiring out of the Israeli intelligence pool: these are among the best security engineers in the world. They don't always find exploits (IIRC there are some versions of iOS they don't have hacks for at a given time), but the game is in their favor, simply because the OS is, well, the size of an OS.