The concept that Netflix, or any company, will expand forever is a major flaw in our economic system. I am not smart enough to know how to fix it, but this cannot go on infinitely.
Netflix executives know this, but it is irrelevant to them because they exist to show how well they are doing at the next quarterly report. Said executives are there to work for a few years, get millions of dollars in compensation, and then leave. What happens 20 years from now is of no concern to them.