ssh by default sends all your public keys to a server. Yes you can limit some keys to specific hosts but it's very easy to dox yourself.
You can try it yourself [0] returns all the keys you send and even shows you your github username if one of the keys is used there.
[0] ssh whoami.filippo.io
"Did you know that ssh sends all your public keys to any server it tries to authenticate to?"
It should be may send, because in the majority of cases it does not in fact send all your public keys.
This is just an awfully designed feature, is all.
Are you AI?
You can wildcard match hosts in ssh config. You generally have less than a dozen of keys and it's not that difficult to manage.
I have the setting to only send that specific host’s identity configured or else I DoS myself with this many keys trying to sign into a computer sitting next to me on my desk through ssh.
Like I can’t imagine complaining about adding 5 lines to a config file whenever you set up a new service to ssh onto. And you can effectively copy and paste 90% of those 5 short lines, just needing to edit the hostname and key file locations.