If my understanding is correct, the KDP Select Fund is for the 'Kindle Owners’ Lending Library' program, where Amazon will loan one book per month to Amazon Prime members.
LendInk facilitated lends under the 'Lending for Kindle' program, allowing a one-time lend between Kindle owners.
LendInk facilitated lends under the 'Lending for Kindle' program, allowing a one-time lend between Kindle owners.
https://kdp.amazon.com/self-publishing/help?topicId=A2JGI9S4...