Why am I banned from Libera.chat?

I used to have an account at freenode. I tried to connect today, fully unaware of its implosion earlier this year. I found out about it and created a brand new account on Libera.chat. I registered my nick with password and email confirmation. Then I joined the #debian channel. As soon as I got in, the Topic banner posted:

You have been kicked by debchange: (You are banned from this channel)

What happened? How did I get banned so fast? Is it restricted now?