To me “tech company” also usually implies that the company has replaced some older thing with a newer technological solution. I think that’s why Netflix intuitively feels like a tech company, even though all the other TV/movie home distribution companies (cable TV, satellite TV, pay per view, even physical media sales/rental, etc.) have always used advanced technology. Netflix is just the company that’s most famously associated with the introduction of the newest mainstream technology for distributing TV and movies: Internet VOD.