Gary Larson was(/is?) famously very against any sharing of his work online:

Okay, “scary” might be a little melodramatic, but years ago, when I slowly started realizing I had a second publisher and distributor of my work, known as Anyone With a Scanner & Associates, I did find it unsettling enough to write an open letter to “whom it may concern,” explaining — best as I could — why I preferred that the people doing this would kindly refrain. I won’t rehash it all here, but my powers of persuasion had at least some impact, and many of my fans were very understanding and responsive. Maybe it takes a warped mind to understand a warped mind. (No, seriously, my thanks to those who removed my cartoons willingly, or even begrudgingly.)

From here: https://www.thefarside.com/about/48/a-letter-from-gary-larson

He goes on to talk about his official website as it is now (2019) and in general I think he still prefers to keep things locked down.