What innovative 'loyalty program' technique did the Cult of Isis use to spread throughout the Roman Empire that made it one of the ancient world's most successful religious brands?

In ancient civilizations, religious cults functioned similarly to modern brand loyalty programs, with devoted followers and specific marketing strategies. The cult of Isis, which originated in Ancient Egypt around 2500 BCE, became one of the most successful 'brands' of the ancient world, spreading throughout the Mediterranean. Its expansion demonstrates principles of brand loyalty and religious marketing that parallel modern consumer behavior.

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Mystery initiation rituals that created exclusive membership experiences
Free grain distribution to all new temple visitors
Mandatory worship laws enforced by the Roman Senate
A military recruitment system that forced conquered peoples to join