Best bugs are the ones you dont share with anyone
I still have some really nice bugs(found on my own) which after 3-4 years still work.
Its a real shame that Bigpoint is too greedy to have a Bug bounty system, where people could report security flaws/gamebreaking bugs for a reward like Google/Microsoft and other big tech companies do.
If they would have something like that I would report a whole list of bugs/exploits I have the next day and Im sure many other aswell.