In places like this on reddit, so many posts are just influencer accounts.

You'd probably be better off reading such reddit forums, and presuming the exact opposite happens.

This is another area to clean up, in the digital age.

Just echoing this. I've worked with marketing agencies who use Reddit to post things like this for their clients.

Both of those posts have the OP linking to specific products, with one of the OPs blatantly posting a referral link to a specific product.

Even without the links or mentioning specific products or brands, marketers will post things like this to build up markets, audiences and anticipation for new products, in this case it is a specific species and variant of bacteria.

It's pretty easy to suss out a lot of those accoutns just by looking at profile age and their comments. Sure, sometimes people sell their accounts but it'll be apparent eventually.