What is the fundamental difference between companies that make turnkey websites and those that work exclusively on their own projects?

Question

Career in IT

In principle, as a programmer, it makes no difference what to write for a salary, be it a turnkey website, be it some kind of service! But when looking at vacancies, some employers emphasize that they work exclusively on their own projects, and do not make turnkey websites to order.
The question would not arise, but they emphasize it so stubbornly!
So what is the fundamental difference between those who work exclusively on their own projects and those who work on a turnkey basis - for a programmer who is looking for a job?

Answer 1

A turnkey website is such a shit-code factory, when you didn’t have time to make one website, you get a second one, or even a third one at the same time. The development of your service assumes that the campaign makes a profit from it, and these are different terms, approaches, quality, requirements.

Answer 2

If you really want to grow, then only inhouse, outsourcing for a programmer is death. An outsourcing company never works for quality.