I've seen speculation that #Freenode changed their server software and the new staff did not know how to import the old database into the new. (To be fair, there's almost certainly a mismatch in the schemas.)
If they wanted to end the steady flow of channels and users leaving, this is one way to achieve it.
And that was enough to bounce me out of any remaining #Freenode rooms which I was in via #Matrix. I’ll remove myself from the Matrix side of those same rooms and I’ll be good.
Related: IRCCloud on Twitter: "Freenode has blocked IRCCloud users from accessing their network. We reiterate our recommendation to switch to a network that is secure, reliable, and has respect for the free choices made by the communities it hosts. Check your project websites to find out where they've moved." https://twitter.com/IRCCloud/status/1404153550159159298