According to rasengan, in his current incarnation as root, the irccloud thing wasn't accidental:

    < root> what accidental irccloud blanket ban?
    < root> I keep hearing about this?
    < mst> I think all of irccloud got k-lined briefly - shit happens
    < root> It's intentional for sure.
    < root> I think someone accidentally removed it.
    < mst> is there a public statement about that anywhere?

(and then nobody ever responded as to why, so I'm afraid that's all I know wrt that particular situation)