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 😭

First of all, I want to give you a warm welcome to this forum.
In regards to participating in some bounty campaign, you will not get banned by just participating in it, your account will only penalize if you broke some rules like plagiarism, spam posting, and more.
You could check out this link so you can familiarize yourself with the rules.
https://bitcointalk.org/index.php?topic=703657.0#post_rules
Now getting back to the topic, personally, I've used to participate in several bounty campaigns and as you can tell I am not banned, reg tagged, or anything because as much as possible I obey the rules they provided. It wasn't that hard, isn't it? There's no secret and such the only thing you need to remember to avoid getting banned just follow the rules and you'll be fine.