Which mathematical software product saw the most significant market growth after transitioning from a traditional purchase model to a subscription-based service?

The digital tools that power mathematical analysis, modeling, and education have transformed significantly over the decades. From simple calculators to sophisticated computational platforms, these products have shaped how mathematics is taught, learned, and applied across industries. This trivia question focuses on a notable trend in the mathematical software industry that reflects broader patterns in product development and consumer adoption.

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MATLAB by MathWorks (introduced MathWorks Subscription Service in 2020)
Wolfram Mathematica (introduced Wolfram Cloud subscription in 2015)
Maple by Maplesoft (introduced MapleCloud subscription in 2018)
SPSS by IBM (introduced SPSS Statistics Subscription in 2016)