system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How will Netflix use data to determine if they should do a Punisher spin off or not?

Presumably they'd want to know if people actually want to see a Punisher spin off or not before spending money on one.

In what ways can Netflix try to "prove" it is something that's in demand?
gpt
How many people watch multiple Netflix originals of other Marvel shows.  
  
If many people who watch DareDevil also watch Jessica Jones, and will also watch the upcoming Luke Cage/Iron Fist/The Defenders, that is a good indication they will also watch Punisher.