Digital Living Network Alliance (DLNA) is a set of interoperability standards for sharing home digital media among multimedia devices. Introduced 2004; 22 years ago.
Google Cast is a proprietary protocol developed by Google for playing locally stored or Internet-streamed audiovisual content on a compatible consumer device. The protocol is used to initiate and control playback of content on digital media players, high-definition televisions, and home audio systems using a mobile device, personal computer, or smart speaker. The protocol was first launched on July 24, 2013; 12 years ago.
Comparisons to watching tv, are usually a TV interface, with a TV device/app, be it an Android TV/Apple TV, etc.
Maybe I'm missing it, I couldn't see a tv interface.
The part where it can send video to any kind of tv is a pretty remarkable piece.