You do realize that people's lives are being impacted, right? Running services of this size comes with responsibilities, and not just to your shareholders, but to society. You can't drive competitors out of business, then restrict access to services that have become essential.
You shouldn't argue that a farmer who was kicked out from Facebook for absolutely no reason should no longer have the right to access a wider variety of local offers for farm equipment on Facebook Marketplace, or have a better chance to sell their produce.
And you shouldn't argue that people are destined for this fate for the rest of their lives because of a primitive algorithm put in place by people who have no morals.
They are not in their right. They are abusing their position, and they are harming people.