Some others appear to be affected:
https://support.google.com/websearch/thread/291344437/my-res...
Perhaps I'm part of an unlucky A/B test?
Either way this is more inconvenient than it sounds. DDG or Kagi here I come.
UPDATE (6 minutes after original post)
Just signed up to Kagi 'Professional' plan ($11US/month [normally $10, but 10% extra due to Australian sales tax presumably]).
I don't understand why google messes with users but the hostility is not appreciated. I guess a/b testing comes at a cost, and might be the right call.
My plan is to use kagi now. May also make a moronic chrome extension to add &num=100 to the end of every google search url (in case I need google, don't like kagi, or it helps others)