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There are already a lot of tools for migrating Blogger sites. I'm sure they could setup a migration path to their free cloud tier.

You're assuming every blog is cared about by its owner, what if it's just the readers?

Switching it to read-only/static and offering migration paths would satisfy both parties then.

if you like something or think it's important, and you want the internet to preserve it for posterity, force it to be crawled by the wayback machine:

(usually stuff i want to save has already been crawled, but i always find it satisfying when something i plug in there hasn't been archived yet)