Can we extract Source from webpage (Especially from youtube)?

[Titan_geek]

Do we get blocked if we keep extracting page source from youtube using This extension"

https://community.thunkable.com/t/extension-get-source-code-web-page-charset-international-language/17395/7

If we can extract can I know how to do it? (I am confused about charset it keeps showing Runtime error called undefined)