Suicide baiting means maliciously encouraging suicide. They targeted one of Near's friends, who was known to have issues with being suicidal, to try to get them to do it. They also doxed several other friends, which damaged Near's friendships. They basically followed and stalked them around the internet, mocking them for anything they could find (e.g. being nonbinary, a furry, etc), documenting what communities they were part of, and identifying targets who might be vulnerable. This deeply hurt Near, as they saw their friends being targeted because of them; they lost friendships over this. There were also plenty of false accusations and attempts to hurt Near's image (e.g. saying they're a pedophile).
My friendship with Near was not public, so I didn't receive any harassment directly since they didn't know about me. That said, after I reported the suicide, they tried (and failed) to take over or lock down my Twitter account and to sign me up for a gay porn mailing list. I'm lucky enough to be a straight cis white dude in a good enough psychological state, which doesn't make me a terribly appealing target; others are not so lucky. They go after minorities, those with psychological conditions, etc.