Immediately after logging a user in, login displays the system copyright
notice, the date and time the user last logged in, the message of the day
as well as other information. If the file .hushlogin exists in the
user's home directory, all of these messages are suppressed.
chmod -x /usr/bin/fortune
(as root or via sudo if you have it), especially if you would need to modify many dot files across many users. This was sufficient to disable fortune/tips on login on 14.1, and is trivial to do with many deployment tools like ansible (which I happen to be playing around with at the moment).