Geoff Greer's GNOME Terminal Cursor Blinking Saga is about how to turn off cursor blinking in gnome-terminal, because the Gnome people are still in love with having their cursor blink despite it being a terrible idea and have progressively made it harder and harder to turn off.

Needing to look this up yet again did cause me to check the Gnome bug to expose a preference UI for this, which caused me to discover that you can actually easily turn this off these days, although not globally; you have to do it for each profile, turning off 'Cursor blinking'. If you have a lot of profiles and are the right sort of person, you may want to write a shell script that uses the gsettings approach, which still works.

(Why I needed to know this is that for my own reasons I'm doing a from-scratch Fedora 30 install in a virtual machine, and of course it came up with a gnome-terminal setup where the cursor blinks.)