The bot does not distinguish between trash or not. That is correct. The bot doesn't make a decision on quality of content. The bot makes a tally of money injected into a post to get it in-front of peoples eyes and then posts the results.
Sure the value of material posted varies from person to person but value of SBD and STEEM is actually the same to all. I believe this bot is trying to combat the statement "As always he who has most money wins." not lie in bed with it.