Has anyone tried something like this before? What is the reddit policy towards bots?
The only site-wide rules I'm aware of are ones against abusing the API (ie, your bot shouldn't be functionally equivalent to a DDoS attack). Other than that, most large subreddits seem to allow bots, but it's up to the individual moderators.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.