Which religious/spiritual subscription service first reached 1 million paid subscribers, becoming a pioneering example of the 'spiritual subscription' business model?

The intersection of religion and subscription models has created innovative ways for spiritual communities to sustain themselves and provide continuous value to their members. From meditation apps to online religious education platforms, subscription-based models are transforming how people access spiritual content and services. Test your knowledge about this growing trend in the religious and philosophical marketplace!

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Headspace (mindfulness meditation app founded by former Buddhist monk Andy Puddicombe)
Glorify (Christian worship and devotional app backed by venture capital firms a16z and SoftBank)
Hallow (Catholic prayer and meditation app that became Apple's App of the Day in 2021)
Glo (formerly YogaGlo, the subscription yoga platform that integrated spiritual practices with fitness)