Many smaller publishers use KDP at Amazon (others have locked in to B&N via PubIt) and must be exclusive to Amazon in order to offer books for free.
That said, the number of freebies has greatly reduced after Amazon started confiscating an entire month's earnings from any affiliate that had "too many" referrals that purchased free books. This dried up promotions and then dried up actual free books. Christianbook stopped letting you download any free books a few months back, too (you can read online or in their app only, for free books).
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