Ask HN: Why is Twitter messing with Meerkat?

Twitter has had an interesting relationship with their developer community in the past - besides the obvious reason that Twitter just bought Periscope, why would they mess with Meerkat?

Wouldn't competition be good? Meerkat is pioneering the mobile live stream model for Periscope. From what I hear Periscope is a supieror product (not sure if I believe it) so why would Twitter signal their fear of Meerkat?