Developers have created look-alike games (2D platformers with bugs) and renamed the IPA to "Hollow Knight" to trick downloaders.
Some clever hackers have sideloaded the Steam demo of Hollow Knight and renamed it. You can play the first 15 minutes (up to Gruz Mother), but then the game hard-locks. Save files are impossible. hollow+knight+ipa+hot
A about Hollow Knight that fans discuss often: hollow+knight+ipa+hot