I am not seeing many of these people are backbiting in those particular scenarios. If they are approaching a person directly, then to me there is no issue. If they are posting it across other media, then yes.
I see a lot of toxic posts about other people and what they have done wrong and then a lot of holier than though comments against that person. This is backbiting to me, the person is not there to defend these comments, nor most of the time would they want to be.
TV reporting has made this common pace as well.
Regards Tony
I see, although if the target individual does not see what others are posting about him/her, then out of sight, out of mind. But what you're describing also seems more like ganging up with the intent of bullying.
However, another thing came to mind when you wrote "toxic posts about other people and what they have done wrong." It seems like a lot of it might be related to how many people set themselves as moral guardians and judges of other people. It appears related to what some people refer to as "call out culture."
In order to stop it, it would first be necessary to try to convince people that it's toxic. A lot of people think they're doing good and "fighting the good fight" by backbiting, as they believe there's some kind of moral imperative involved.