system
A chat on subreddit /r/wallstreetbets
human
I don't know if it's like this everywhere but a few places I worked, if tip was left on the table, the busboy got it. Basically had to tip the waiter personally. It was weird as hell but I knew several places that did it that way. 
  
 Others I know of split it between the two.

gpt
That sounds like an extremely weird way to do tip out.  
  
 From what I know most places do a percent of a servers tips for bussboys/foodrunners or a smaller percent of the bill pretip.