[tinkerrr]

The "community" cannot blacklist anything, it's the miners. And it is very unlikely that miners with >50% of the network hashrate would agree to this, since most heavy miners don't really belong to the "community" but are just in it to mine enough to be able to sell to cover their hardware and electricity costs.

[VMG]

If merchants and exchanges refused to accept block rewards from miners that don't follow a certain rule set, the miners couldn't sell their block rewards.

It's a complicated game.

[iancarroll]

Yes, the "community" can with modification to the code.