Flameshot is local. May have a subscription service, not sure.

But flameshot is extremely fast and does 95% of what I'd do in gimp anyway, without having to open a whole image editor and saving a picture. I can directly copy it to the clipboard and paste it somewhere.

Yeah it sounds good, I just rarely do screenshots so I stick with what I know. If my workflow required a lot of screenshots I might either automate it a bit more or look at other tools.

I'm actually about as likely to just pull out my phone and take a picture of the screen as to use software-based screenshots.

I also use scrot, because it's simple. Almost always use 'scrot -s', so I get to do immediate cropping, and it's trivial to bind to a shortcut in i3wm.