Which spiritual subscription service was the first to reach 1 million paid subscribers and pioneered the 'mindfulness as a service' model?

In today's digital age, religious and philosophical organizations have embraced subscription models to sustain their operations and connect with followers worldwide. From meditation apps to religious study platforms, subscription-based services have transformed how people engage with spiritual content. Test your knowledge about this growing intersection of faith, philosophy, and recurring revenue models!

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Calm
Headspace
Sattva
Ten Percent Happier