I am new here. I know more than 70% or more they using Bitcointalk Account For Bounties and other earning purpose. My some friends told me that bitcointalk account ban if they doing task or joining on bounties? Is it true? How to avoid this things. I always wanted to know.
Please Tell If you know about it & guide me properly if I wrong 😭 
Your account is newbie. I advise that instead of doing bounty learn some useful stuff here. Kindly refer to the attached links that will help newbie avoid being banned.
Newbie-Read before postingUnofficial list of (official) Bitcointalk.org rules, guidelines, FAQ
I don't think joining bounty can make you banned its not prohibit to join it. However spamming in forum by joining campaign such as signature could literally make your account banned.