There’s nothing immoral about it if you tell applicants. It’s basically how hiring for sales is done and no one is under any illusion that you won’t keep your job if you don’t perform.
The point here is more nuanced than the straw man you’re painting. Everyone that passes the interview process stays is a bad sign because it confirms something highly unlikely about the interview process: that it succeeds in generalising aptitude.
You’re right that startups can’t do it though other than through intern programmes. Lots of companies do it through intern programmes. Only the fit interns survive and get a job.
The point here is more nuanced than the straw man you’re painting. Everyone that passes the interview process stays is a bad sign because it confirms something highly unlikely about the interview process: that it succeeds in generalising aptitude.
You’re right that startups can’t do it though other than through intern programmes. Lots of companies do it through intern programmes. Only the fit interns survive and get a job.