Which subscription model innovation has been most widely adopted by major mathematics textbook publishers in the past five years?

The world of mathematics textbooks and educational resources has undergone significant transformation in recent years. Publishers have had to adapt their business models to remain relevant in an increasingly digital world where information is often freely available. This poll explores how leading mathematics publishers have pivoted their strategies to maintain profitability while serving the academic community.

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Access-based pricing where students pay for customized problem sets rather than complete textbooks
Interactive platform subscriptions bundling textbooks with adaptive learning tools and real-time assessment feedback
Blockchain-verified credentialing systems that charge per mathematical concept mastered
Pay-per-solution models where students purchase individual worked examples as needed