Hmmm... that would entail you going short when they go long. However, the potential payoffs from going short are asymmetric, with theoretical unlimited downside risk.
How would you deal with that, or would you try to execute through options?
You could only trade when they go short.
Potentially Yes! You will be able to filter Nvestors and companies in a very powerful way. (Still in alpha development, but you can try it out after logging in: www.nvest.me/crossfilter)