Well, the point is than people are purposely exploiting unranked to bully weaker player / get easy win. As there is no enforcement taken whatsoever again them.
Seriously, someone who get over 100 game win streak in unranked is not doing that for “teaching game” or because he is “anxious to play ranked”, they are doing it becasue it’s like stealing lunch money from a kid. Most likely cheating with AI as well. And they get freepass from doing so.
And not everyone notice this is a unranked game to begin with the way the interface is done, neither as not everyone take the time to go trough the history of every single opposant before accepting a challenge.