I doubt for the most part it's people being hired. I think mostly it's probably people in low income countries who make a living posting as different identity on social media.

How are they making a living posting political propaganda of they aren’t hired?

Advertising revenue directly from X, posting affiliate links to products or gambling/crypto sites, and directly asking followers for money. Or they're being paid by clandestine operations such as Internet Research Agency.

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X has revenue share for popular posts.