The pessimist in me thinks this is to boost real human use of their platforms by using AI engagement.

https://en.wikipedia.org/wiki/Dead_Internet_theory

My only assumption is that bots are downvoting the above comment, given the readily-available evidence[1][2] supporting it.

1. https://en.wikipedia.org/wiki/Social_bot#Meta

2. https://en.wikipedia.org/wiki/Dead_Internet_theory#Facebook