There's the marketing aspects of Bitcoin that are huge for its popularity:

• Organic engagement: no paid ads, just users telling friends and family what they find and exchanging knowledge
• Brand recognition: Grandmas know bitcoin and have an idea, even if superficial, of what btc is.
• First to market: being the first to do something gives an unquestionbable market advantage
• Loyal users: most bitcoins ever created were never spent, and may never be
• A great name: Bitcoin sounds like digital money