Most people were leaving this alone, but since you replied. Might as well let you know that Determination709 is a young child who doesn't understand internet etiquette. There were a bunch of posts made by them tagging other users and initially trying to be helpful in a disruptive way. I feel a bit bad just for responding here. So now you know why someone might want to block someone else.
At the heart of it, it seems that the kid wants to make friends, but they aren't mindful about other people's boundaries.