Which innovative pricing strategy helped the World Wildlife Fund (WWF) significantly increase donations for endangered species conservation in the 2010s?

Conservation organizations worldwide use strategic pricing models to fund their wildlife protection efforts. From membership tiers to adoption programs, these pricing strategies balance accessibility with sustainable funding. This trivia question explores how one major wildlife conservation group revolutionized their donation model with a specific pricing innovation that dramatically increased their effectiveness.

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The symbolic animal adoption program with tiered pricing levels ($25-$250)
Monthly subscription model with exclusive content access ($5.99-19.99/month)
Dynamic pricing based on species endangerment level (more endangered = higher price)
Blockchain-based NFT wildlife certificates with appreciation potential