My guess is no, too, but I figured I'd make sure. It's low priority for me. And sometimes asking these sorts of questions helps give me an idea of something to write!

BTW, I think it was D'Arkun from '21 IFComp that had the idea of including a password-protected PDF map, where the password was revealed once the player was 20% through the game. That's one idea for reasonable obfuscation that isn't impossible.

As for walkthroughs, one way to do things might be to use ROT-13 for one sentence, ROT-14  for the next and so on, cycling through ROT-25 and ROT-1. That would help people not reveal too many hints at once. I'd think a Python script wouldn't be too hard. For deciphering it, ROT13.com would do well, since it only handles one ROT-X at a time.

(ETA: I'm sure I saw 3 works with no cover art, and now there are 2, and I don't think any have been removed from the comp. So as long as it isn't an "I didn't see how to add this" thing, it's okay, and I certainly have no problem with competitors adding cover art, because that sort of thing motivates me to play a game. Still, it's nice so people have one less thing to worry about for next year.)