I think you can't really approach murder mystery series with Reddit in mind. When you have literally thousands of people that can collaboratively theorize in one place, it's very likely people are going to come close to figuring things out. Seems a little futile to try to work against that, because you don't want to write something that is so convoluted no one was ever going to see it coming. It never feels well-written when the answer just comes out of nowhere and isn't something anyone could've predicted.

Write for the people who aren't on Reddit after every episode trying to figure things out. Even as big as Reddit is, they're still a comparatively small minority.