Part of me feels that keeping on top of broken links is a Sisyphean task, but it'd probably be pretty easy to update my bot code to do this.
Here are the URL counts that I see in the 20230225-002009 dump (around 500 in total):
227 www.geocities.com
168 www.geocities.jp
56 www.geocities.co.jp
22 music.geocities.jp
5 geocities.yahoo.co.jp
5 geocities.com
3 it.geocities.com
3 es.geocities.com
2 uk.geocities.com
2 1st.geocities.jp
1 sky.geocities.jp
1 park.geocities.jp
1 mx.geocities.com
1 movie.geocities.jp
1 island.geocities.jp
1 geocities.jp
1 de.geocities.com
1 br.geocities.com
1 beauty.geocities.jp
1 au.geocities.com
1 akiba.geocities.jp
All of them seem to use http schemes rather than https.
There are ~20 www.geocities.ws and geocities.ws URLs that should be preserved; that looks like it's an ironically-named webhost that's still operational.
I've created the remaining 466 edits: https://musicbrainz.org/user/derat_bot/edits/open
(Some of the relationships were already marked as ended; some URLs had multiple relationships.)