I don't think "masificación" refers to mass production as such; the idea, I believe, is more mass distribution. The "masificación" of a technology is mass (very widespread) use, practice or availability: "la masificación de Internet", "la masificación del reciclaje".

I agree with you that it's better in English (as is often the case) to turn the Spanish verbal nouns, "promoción, difusión y masificación", into verbs, either infinitives or gerunds: methods to promote or methods of promoting.

"Masificación" in this context is not so much something that just happens as something that is deliberately achieved. I think "provide mass access to" would express the idea. Here is a relevant example of this expression in an article on podcasting:

"Podcasting developed because new web-based technologies could distribute and provide mass access to (‘cast’) audio files, and because small personal devices for playing audio were becoming widely available at a declining cost."
https://www.academia.edu/17505985/1_Podcasting_technology

And another, from a review of Andrew Keen's book The Cult of the Amateur, on Internet culture:

"The hidden premise of Keen’s first argument is that the modern ecosystem is the best or only way to nurture talent and provide mass access to its works."
https://www.huffingtonpost.com/david-weinberger/andrew-keens...