What concept did the Kodak success establish as a mass-market hobby?

Answer

Photography

The ultimate, long-term result of the Kodak system was the establishment of photography itself as a widespread, accessible, mass-market hobby. By drastically simplifying the apparatus and bundling the processing via the service model, Eastman removed the major barriers to entry for the public. This allowed everyday people to easily document personal milestones, family life, and historical events with an ease that was previously unimaginable, fundamentally shifting the focus from the technical craft to capturing the moment.

What concept did the Kodak success establish as a mass-market hobby?
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