Lazy loading YouTube videos and embedding in email

I haven't looked at the state of embedding YouTube videos in content and emails, but I came across this blog this morning discussing a technique for lazy loading YouTube videos where you only download the poster image on page load and download the video when you click on the image.

https://dev.to/haggen/lazy-load-embedded-youtube-videos-520g

This seems like a good idea that should be used in IPS4.

Also, the last time I checked, IPS4 does not embed videos in email, but if you have a link to the poster image, you could show that image with a link to play the video in a browser. This way, content would appear the same in both the browser and the email client (which is a good thing!).