Ashame it is allowed. I also report these kind of toxic players, but i dont really see any result. I have faced players that just lower their 1v1 rating. Aoe2.net clearly showed this (20+ losses in 1h is clearly an indication something is wrong) and his main account had the same user name. Nothing really seem to happen after the report, so i he could continu smurfing. I even face him 3x in a row…
This wont solve anything. Everyone gets bad match ups at the start, because no one has a rating. After the initial period, the same accounts come on top and you are back to the same spot as we are now.
A reset is part of the solution, but not the full solution. The devs need to change the calculation behind the rating update. This is already discussed in the following thread. I suggest reading those solutions.
After such fix is implemented, a full reset of the ladder seems like a good idea.