Ok here we go:
recruitment:
they only take low timers from the KLM Flight Academy when they need.
Also NLS, Martinair school and EPST were invited to be selected to undergo their Compressed Bridge Course (+12k) and then could get an interview.
Only a few made it.
qualifications:
So like above, or when times are good: 1000+ hours commercial flying.
Also, you have to have KLS, NLS background.
So in 99%, KLM only hires ex KLM FA.
They say the long way in is to become instructor at KLM FA and after some years you can get in.
It's not nice, but also not illegal, since they can claim to have enough new students coming from the KLM FA.
And the people that invented this form of malpractice, are the ones hired in the past with non KLM FA on they CV!
I heard many stories from insiders there that it is going to change but I am hearing this for years now.