Fediverse

? It's a well established strategy. I'm not speculating, this is how social media marketing works. You can find all sorts of resources on how marketers strategize about these things.

https://old.reddit.com/r/SocialMediaMarketing/comments/1edu8u6/commenting_as_a_social_media_strategy/

This has gotten quite pedantic but being paid is not a requirement, just is most often how it's done:

Advertising (https://www.merriam-webster.com/dictionary/advertising) 1: the action of calling something to the attention of the public especially by paid announcements

I'm not trying to tell you how to post, genuine recommendations are the only form of advertising I respect. But it is advertising and companies have every incentive to astroturf that.