To a billionaire, hiring a few hundred Nigerians to upvote and share their propaganda is so cheap that it’s like you buying a cup of coffee.
They use professional paid services from these low labour cost countries all the time for publicity or to control the narrative.
By some estimates 20-60% of everything you see on social media is generated by a bot farm, depending on the forum in question. An analysis of Reddit showed some subreddits are 80% AI generated.