The Non Existent Bundle ID error as far as I may know has only been prevalent with the game Cookie Run: Kingdom. I saw the Admin said that this is a known issue with free apple ids, this was said on October 26th 2021 and there has been no new information on this matter since then. After my investigation I've come to the conclusion that this problem has something to do with the decrypted ipa of crk.
First I attempted to install this particular deb file into crk:
because this is where I saw some users reported the bundle id problem. After installing that deb, the error occurred when I opened the game. Then I decided to install iGameGod into crk and got the same bundle id error when I opened the game.
Note: All of the above was used with the decrypted ipa (obviously because you can only install debs with decrypted ipas) which was obtained from https://armconverter.com/decryptedappstore/
Upon my curiosity, I decided to inject that same deb file into an already modded ipa (for non jb) of crk and it worked, though the deb hack wasn't actually working in game but its mod menu was opening and stuff, the point is that there was no bundle id error. I then proceeded to inject the same already modded ipa with iGameGod and it also worked well. So if our free apple ids are working with everything except this specific decrypted ipa, self explanatory?
Feel free to enlighten me.