To send a message to the core devs that they can't do whatever they feel like.
Discussion
Not updating is the same thing.
No, by running knot we are signalling that once we gain sizeable majority and more people actually get educated about block wars then we can implement the 300kb block size limit proposed by Luke.
This has to be done to price our the spams faster and keep Bitcoin decentralized.
Imagine every store running their own nodes!
Thar won't be possible with 4mb blocks