People need to stop calling companies “big tech” because every large cap company uses technology in a way that used to be exclusive to one tech industry.
That’s still not true of most large companies like say Walmart or McDonalds which still invest a great deal in technology.
Is Google a tech company? Probably, but technically they sell advertisements, not software. You could say that they make money by operating ad-selling software. Walmart is a company that makes money by operating purchasing, distribution, and retailing software. An old west General Store owner could, if his records were lost, make a good guess as to what he should by from which big city distributors, when and how much of it to stock, and how much to sell it for, conversely, zero people have a comprehensive understanding of Walmart's product lines, they're just cogs in the software-powered machine that makes the corporation work.
Every large company today is dependent on software. I agree that it's a bit absurd to suggest that this means they're all tech companies.
Are they primarily dependant on off-the-shelf software? Possibly not a tech company. Is their software development team bigger than the whole of the rest of the company put together? Probably a tech company. Have the developers convinced everyone else to form squads and hold all the usual agile ceremonies? Don't @ me.
Nice.