Why are people down voting this?

It may be a bit pedantic and out of topic duty the meme, but it’s true. .MP4/WebM would have the same effect much more efficiently and with higher quality

Using wefwef.app it autoplays

The “!g” is part of something called “bangs” on DuckDuckGo. Bangs are prefixes to redirect your query to another search engine. For example “!g How to pet a cat” will redirect you to Google, searching for “How to pet a cat”

Other useful bangs are “!m” for maps, “!gi” for Google images, “!so” for stack overflow.

You can find more about it at the bangs page: https://duckduckgo.com/bangs