All it takes to chat ban someone, or get chat banned, is multiple people reporting
If I ever duo, and we both report someone, I pretty much always get a msg about 'helping to punish negative behavior'.
If I ever get reported by a duo, even if I literally said nothing more than 'top' or 'care', often just because I didn't support for them, I get chat banned. Every time. Multiple accounts, multiple people, multiple IPs we have observed this on.
Seriously? Is that all the tribunal is? Premades fucking over solo q players, every single time? This is pathetic, frankly, for a feature that is supposed to be about players giving back, when it has just turned into essentially a popularity contest. Sick of this happening. Maybe its time for DOTA2.