For a library like libjpeg-turbo, it's probably best that it stays in maintenance mode.

I mean... it's JPG. It's the traditional lossy image format that everyone's been using since forever, and that hasn't received any changes. It also shouldn't receive any changes, as its big advantage is its compatibility. If you want something better, you'd use other formats like avif.

I'm all for paying open source maintainers, and this guy should receive money so he can continue to fix bugs and do other minor maintenance work. But I don't see why there should be new features in the default jpg library.