saturno
It is based on ability to pay. If you can somehow live on €800 a month, then that is ability to pay, when compared against someone who can't.
It is a direct economic relationship.
Most of the €800 a month FO's will be somewhat subsidised. This will likely be by parents, grandparents, partners or whatever. But make no mistake, that is selection by ability to pay.
250 hour pilots always struggled to get their first job. However, in the past they didn't directly destroy the entire industry T & C's.