Final answer:
The MacArthur Foundation is known for allocating substantial funds to various causes, similar to other foundations and philanthropists listed, but the specific area of their $100 million commitment is not provided in the question or reference list.
Step-by-step explanation:
The MacArthur Foundation has been known for its substantial commitments to various initiatives, often focusing on critical areas such as societal development, environmental preservation, and innovation in education and science. Although the specific initiative from the given list to which the MacArthur Foundation has dedicated more than $100 million is not mentioned, many similar foundations, including the Burt and Deedee McMurtry, Michelson 20MM Foundation, National Science Foundation, The Open Society Foundations, philanthropists like Jumee Yhu and David E. Park III, and the Brian D. Patterson USA-International Foundation, are recognized for their philanthropic contributions that target similar areas of societal benefit.