How would that fix the problem ? Echo-Chambers such as Reddit exist because there is a single opinion coming out of it. It's a pool of people aligning with themselves and frying out anybody that is not following their opinion.

This would also create a tool to cast target people to oblivion.

The real question is to ask what is the real problem. I understand that an online places can be gritty because of incivilities, but a dogme is much more scarier to me than an online idiot.