Which subscription model strategy has been proven most effective at increasing long-term user retention for language learning platforms according to 2023 industry research?

In today's digital world, language learning apps have revolutionized how we acquire new languages. Their subscription models vary widely in approach and effectiveness. This poll explores an interesting trend in how language learning platforms structure their subscription tiers and how this impacts user commitment and learning outcomes. Test your knowledge of the business side of linguistic technology!

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Offering unlimited access to all languages at a premium tier while restricting beginners to single-language subscriptions
Implementing a 'streak-protection' feature that allows subscribers to maintain progress metrics even during brief lapses in subscription
Providing significant discounts for annual subscriptions while charging premium rates for monthly access
Creating subscription tiers based on linguistic difficulty rather than content access (e.g., higher tiers for more complex languages)