What does this mean?
Discussion
He mistakenly selected SIGHASH_NONE when broadcasting his transaction.
This allows anyone to RBF his transaction and change the outputs.
A bot that steals inscriptions replaced his transaction and burned 0.79 BTC to mining fees.
Sparrow now has a warning, but IMO this options shouldn't even be clickable for single input transactions:
https://github.com/sparrowwallet/sparrow/commit/8d7308bc37fbf957c32fd9756086b35d9585740e
nostr:npub1hea99yd4xt5tjx8jmjvpfz2g5v7nurdqw7ydwst0ww6vw520prnq6fg9v2 do you have a ādeveloper modeā or ādanger zoneā toggle that enables these pitfall toggles?
Pretty good bandaid for now. 
lol