I’ll preface this with: maybe they still exist to a small extent, but get little support from the recommendation algorithms.

The late Mark Fischer theorized on this.

• In the period between the end of WWII and the start of the neoliberal era (e.g. Thatcher & Reagan), the working class in the capitalist imperial core experienced a period of wealth that never came before and almost definitely will never come again^[1]. This gave people the free time and the freedom to take risks—artistic and otherwise—as never before.
• https://en.wikipedia.org/wiki/Capitalist_Realism
• https://en.wikipedia.org/wiki/Hauntology_(music)
• Mark Fisher – The Slow Cancellation of the Future (2014)

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Edit to add, this sequence in Children of Men literally sent shivers down my spine, and must have done so to Fischer as well, because he starts Capitalist Realism with a reference to it. https://www.youtube.com/watch?v=sJO0n6kvPRU