This isn't a crazy innovation but something I didn't see a direct and easy way of so I created for my own use cases. This is a template repo that runs a GitHub actions script every x hours to get a new screenshot of any URL. If you use the direct GitHub image URL, the image is "dynamically updated".

Pretty cool stuff, well documented too, I use it to keep the image in the repo for my blog updated and it by default runs every 24 hours.