Which psychological principle do music streaming services primarily leverage when they offer 'Wrapped' or 'Year in Review' features that showcase a subscriber's listening habits?

In the competitive music streaming industry, customer loyalty programs have evolved beyond simple points systems. This poll explores how major music platforms utilize psychological principles to build their subscriber bases and reduce churn. Understanding these strategies reveals how streaming services transform casual listeners into long-term subscribers through carefully crafted loyalty mechanics.

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The Endowment Effect - where users value something more when they feel ownership over it
The IKEA Effect - where users value platforms more when they've invested effort in customizing them
The Identity Principle - where users form stronger bonds with services that reinforce their personal identity and self-image
The Scarcity Principle - where time-limited features create a sense of urgency and special access