What doesn't? Imagemagick, for me, is the one stop shop for all kind of image filters, resizing, recoding, etc
I'm completely unsurprised about these bugs given the number of serious problems I ran into. Granted, that was something like 17 years ago, but these veteran projects have a tendency to hang around on life support for decades. Projects that are huge messes don't generally get cleaned up without massive outside pressure (see: openssl).
It's an SEO thing. Searching "resize image" would almost always lead to ImageMagick examples that would work well enough to not require looking elsewhere. Almost every time I've used it, it's been for a few simple image operations (downsize, rotate, etc) that happen once on a user upload of a tiny site so performance wasn't a concern.