I think Rizzrack answered that question quite efficiently

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And from
this post made by nutildah we can find out that spammers are paid with 2.38$/post. Or, at least, they were, in 2019. Probably the payment rates are higher now. Pretty good, right? Not many signature campaigns can pay this amount.
I'm not surprised by users recycling content, I'm sure you've noticed with the amount you've reported, that these bumping services which are being used, are very likely being run by the same people. Since, they're pretty much identical to one another. It's absolutely ridiculous, the amount of accounts which are posting the same stuff every day, and have been doing that for years. Plus, taking a look at that link Nutildah I can now understand why, apparently its good money to make minimal effort posts. I'll be honest the amount of money these people are earning has surprised me.
Do you think that you can take a look at these four posts remaining, please?
I've handled all remaining reports I have in my report queue.