We tend to reserve the word "tech" for new technology especially. Cars, power tools and horse wagons were also new sexy technology once upon a time, but no-one calls companies making those products "tech companies". The categorization from "tech" to "normal stuff" happens when a technology becomes ubiquitous part of our society rather than play stuff of early adopters and hackers. Arguably this has recently happened also to social media, internet advertising and many other internet technologies so maybe we should move on and recategorize those things as what they are instead of "tech".

So what is "tech" now, if we take the definition to be "new technology not yet widely adopted by everyone's grandmother"? Maybe some of the blockchain stuff? Nuclear fusion? Reinforcement learning based AI agents? Self-driving cars? Hyperloop? Homomorphic encryption? Nerve implants? Robots capable of moving in unpredictable environments (like Boston Dynamics has)? Artificial meat? Space ships?