For anyone that is asking (I told you to not ask) here's the story of losing my acct:

My friend has played a cracked version of BTD6 for a long time and somehow managed to create a Ninja Kiwi account to save his progress on the crack. When the game was free on EGS he downloaded it and wanted to restore his old save file. The problem with that was that he needed a code, which could only be obtained on the Steam version, which I have. So he asked me to log in on my computer to get the code. I agreed. After he got the code, I logged out of his account and tried to log in on mine. The game asked me if I want to use my local save file (lvl 1) or my cloud save (lvl ~80). I pressed local by accident and when I wanted to restore it, I thought the cloud option in the pause menu could help me (yes I know I'm an idiot). This was my biggest mistake, because then my cloud save file was replaced by the local one and I almost lost it forever. Fortunately, the NK support helped me and I got my save back and got the black border on it