It is not a good idea when WG tries to put captchas to battle lol.Players already does not like the battle queue and waiting time before each battle....if they put that to battle then I am sure people will complain more.Still the only way they can ban u is looking at your movement, account log and statistics when u got a lot report in a short period.Mods may can join your battle and look for your account play style or maybe if they can get some vids from player which record u in some battles and track the statistics.There is no formal system to auto ban your account coz u use bot.It take long time and if u bot smart u never get caught.Never bot 24/7 and also u need to bot the right tank and balance your account statistics.It is easy to see an 24/7 botter through statistics.but a smart botter people hard to notice it.They may blame u hack but statistic will just show u at an average or bad player only.Bot at the right time,right tanks and not overbot.I have used this bot around 2 years and my account never got even 1 warning from WG,and I bot like 70% of battles so far.
If u did wrong way then u just put your account at risk.If u want to have a "safe" service with good stats on yoru account.I can say better u pay for pilots who can grind your account.It is hard to find a trustfull pilot who can grind your account and his skill is ok and the cost for those pilot is like more then 10 times compare to TL every MONTH.