Which e-commerce innovation first allowed religious organizations to offer 'pay what you want' pricing for digital sacred texts and philosophical works?

The digital age has transformed how religious and philosophical texts are accessed and distributed worldwide. As traditional publishing meets modern e-commerce, religious organizations and spiritual thought leaders have embraced various platforms to reach their audiences. This poll explores a significant e-commerce innovation that revolutionized access to sacred and philosophical texts in the digital era.

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Humble Bundle's Faith Collection model (2011)
Amazon's Kindle Divine subscription service (2013)
Apple's iSacred platform (2010)
Google Play's Spiritual Texts Initiative (2014)