chickens flourish
Not many vegetarians would agree. Is farm chicken life is worth living? Does the large number of farm chickens really have net positive effect on animal wellbeing?
Animals that aren’t useful
What about the recreational value of wild animals?
Even humans are capable of producing content (e.g. program code) where the real meaning is obfuscated. For some entertainment, try to look at this Python script in Stack Exchange Programming puzzles, and try to guess what it really does. (The answer is here.)