This is cool but in the last 12 years I have never written a cover letter for a role or read one as a part of the hiring process. Maybe other markets outside of tech still use them or for entry roles.
Every couple of years I apply for jobs and only recently I noticed there is a field to upload/write such a cover letter. If it was always there I never acknowledged it. And thank you for confirming no one would read it anway which was my first reaction to noticing it.
Who comes up with this stuff? I can only imagine the conversations in HR: "Cover letters. That's it! Now we only get applications from people who are involved. The ones we're looking for. Amazing!"