It's weird to me why companies like Uber or Airbnb or Spotify are considered "tech companies".

What tech do they develop? Their own app & website? By that logic any modern business is a tech company.

Hell, even schools or libraries have websites and apps. Are they tech companies? Of course not. It just makes no sense.

Uber does taxis. Airbnb does amateur hotels. Spotify does music. The fact they use tech to make that happen doesn't matter, literally everyone does that in the 21st century.