Which of these wildlife conservation product initiatives was widely considered a market failure, losing millions despite celebrity endorsements and extensive marketing?

The animals and wildlife conservation market has seen numerous product innovations over the years - from advanced tracking technologies to eco-friendly merchandise designed to raise awareness and funds. However, not all wildlife-focused products succeed in the marketplace. This trivia question explores a notable product failure in the wildlife conservation sector that teaches valuable lessons about consumer psychology and product design in this specialized market.

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The WWF 'Adopt an Endangered Species' plush toy line with embedded blockchain verification (2019)
National Geographic's 'WildCam' home security cameras that donated 30% of profits to habitat preservation (2017)
The 'Earth Rangers' subscription box of sustainable wildlife products that failed to gain traction despite $40M investment (2018)
Discovery Channel's biodegradable wildlife photography equipment made from plant-based materials (2020)