The best one was an employer's site that described itself as "Easy Apply"! You had to give it a resume, which it parsed, badly, and sprayed randomly into about a thousand text boxes. I thought maybe the problem was starting with a pdf, so I began again with a Word document. The results were exactly the same, suggesting they exported to pdf and used the same shitty parser.
Having to rearrange all this text into the correct boxes was annoying enough, but they weren't just vanilla text boxes. They were janky javascript abominations that responded to input really slowly.
And employers moan that they have trouble finding good staff.