I forgot why I got permabanned

Around a year and a half ago, I had this account permabanned. I had a ten game winning streak for ranked, but I admit I flamed a lot. I'm just curious to see why I got banned, but when I checked the email I used ([email protected]), it was obsolete and I couldn't access any emails. I don't remember any suspensions before the permaban, so it came as sudden for me. Please let me know the reason I got banned if possible, whether the reason was boosting, or too toxic, afk, etc.