Ride services/Food delivery company cannot function without humans.
Simple apps and games don't necessarily need to keep getting better all the time; a successful one could likely coast for some time without needing much intervention.
SREs job is exactly this. Prevent future incidents. Prevention is much cheaper than cures (mostly)
With that definition, it's also unreasonable to me that 100 years ago, there wasn't any tech company
Because we all know that VC's don't invest in non-tech companies anymore.
At the high level, Amazon is also primarily a logistics and pricing company.
They could also license their tech (or white label it a la Shopify) and make a lot of money, but they realized at some point that owning the user relationship was key to unlocking more value than just owning the tech.