> So you are saying a company should never reinvest profits in the company to support another money losing business until it’s profitable?

If it makes it impossible to set up a competitor? Absolutely, yes.

> Should Netflix for instance not invested money from renting DVDs to invest in a streaming service?

Netflix was not priced below the cost of production from the beginning. You're confusing sustainable pricing and paying off all the capital spending immediately at launch.

A better example is Doordash when it was heavily subsidized by VC money: https://news.ycombinator.com/item?id=23216852 And it now faces several anti-trust lawsuits.