Cleaned and upscaled:

Cleaned and upscaled:

He's creating hundreds of images that will continue to spread, ensuring that the artists never get credit for their work.
Xkcd and other artists who don't use water marks:
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CC BY does not tell you to watermark all your works based on it.
You could simply provide attribution via text/hyperlinks.

WITH attribution ads left intact
Switch your router on and then switch it off.
That will fix it.
Nope.
😆 No, I won't.
Why not fix up a dull punch line or tidy up a drawings weaknesses?
Too lazy to do that.