I am a member and got the message.
Yahoo is self destructing: no new content from 28.10, and no archiving of old content from December.
Hence, the switch to io is vital to preserve accumulated knowledge.
io makes transition seamless, but at a price: AUD220 for a premium account (10 GB) for one year, then the possibility of dropping to free (1 GB).
I am having to bite the bullet with my pub group.
Google is not matching io: it has no transfer offer (free or paid). Or at least, I can't find any information on such an offer within the google website. It is just as arrogant as farcebook and yahell anyhow.
The one yahell group which went to google runs a private archive anyhow.
I still can't judge which is better for users.