A startup is, by definition, a newly formed business venture that is in the process of "starting up" its permanent business operations. Thus, a food truck, a taco stand, a shop, a web app...those are all startups if they are new businesses.
This term existed before the tech industry existed and will continue to exist after the tech industry fades. The only reason it is associated with the tech industry today is because there are are currently far more startups in the various tech markets than there are in other industries. Consider: a great many of the "startup" successes of the past 3 years are not tech startups; they are normal businesses which incidentally used technology in their business, like Stripe, AirBnB, etc.
This term existed before the tech industry existed and will continue to exist after the tech industry fades. The only reason it is associated with the tech industry today is because there are are currently far more startups in the various tech markets than there are in other industries. Consider: a great many of the "startup" successes of the past 3 years are not tech startups; they are normal businesses which incidentally used technology in their business, like Stripe, AirBnB, etc.