It's a good point and it really is a fuzzy distinction, but consider Wal-Mart. They employ a lot of tech, but the goal is to put a product in the hands of a customer in exchange for money[0]. Visa is closer to the boundary: it's doing transactions, and a bigger portion of that business is just shuffling bits around than what Wal-Mart does.

But then again: is Amazon a tech company? AWS is, but the retail portion is less clear.

[0] Isn't that Apple too? Yes, but the sole product is a technology product (even if it has fashion aspects like the watch).

No, not remotely. Some companies use tech as a tool of convenience but have no need of being involved in its development. For example anyone who operates a small-time retail business who sells via Amazon or their own e-commerce site. Companies like the ones I refer to depend on having and developing sophisticated technology as a part of their core competencies and business model.

For example, there isn't a (sane) bank on the planet that would use, say, Visa as their payment processor without the various indemnities against fraud in the contracts they sign. And those indemnities are only possible if Visa has a sophisticated payment processing network with fraud detection.