Pretty every industry these days has a software component, but software is a major revenue driver specifically in the tech sector, so of course this is where a lot of LLM usage is showing up. Tech is also a sector where "build fast and break stuff" is a common ideology, and LLMs play right into that. There is also a long warm up period to writing production code via LLMs in industries that still run a lot of their infrastructure on old mainframe code(it is understandable), banks for example, or public sector, or energy. LLMs at the current grade are still a fairly new phenomenon, it will take time.