I don't mean the act of embedding or direct linking in general, but in link aggregators these comics are well known for their alt text, which cannot be seen from the direct link.
I think a good practice might be embedding the comic directly in your comment along with a "source" link.
I raise you this: https://imgs.xkcd.com/comics/lisp_cycles.png
Directly linking the file of an XKCD should be illegal
https://xkcd.com/297/
Linking to images should be illegal
I'll let Randall Munroe decide that himself, considering the fact that he provides URLs for hotlinking below the comics
I don't mean the act of embedding or direct linking in general, but in link aggregators these comics are well known for their alt text, which cannot be seen from the direct link.
I think a good practice might be embedding the comic directly in your comment along with a "source" link.
It's
titletext, or in web comic circles, hover text. The linked comic'saltis simply Lisp Cycles.deleted by creator