WotLK playing on friend on account is risky ?

[Markpivipi]

If a friend give me his account and if i push top rank arena on his account may i can be banned on my personal account and on the shared account ? By the moment he agreed to give me his account why this thing could be not allowed its kinda weird

[shhnedo]

As long as you just play it and earn your rank, it's completely fine. You're just missing the point why acc sharing is forbidden and no support is provided. I'll give you this small hint, you can figure out the rest - there have been multiple people begging here on the forum for their accounts back and swearing they would never share their passwords ever again.