This is baffling to me, since I’ve always thought of gzip (or other) compression being applied by the web server (or configured to do so) only to text formats l

This is baffling to me, since I’ve always thought of gzip (or other) compression being applied by the web server (or configured to do so) only to text formats like HTML, JS, CSS, etc. I’m curious to know which badly written server or sites compress already compressed content like images and videos just because a user agent says it’ll accept compressed content?