[lightbyte]

Actually yes, it has been shown effective:

http://comp.social.gatech.edu/papers/cscw18-chand-hate.pdf

>We find that the ban worked for Reddit. More accounts than expected discontinued using the site; those that stayed drastically decreased their hate speech usage—by at least 80%. Though many subreddits saw an influx of r/fatpeoplehate andr/CoonTown “migrants,” those subreddits saw no significant changes in hate speech usage. In other words,other subreddits did not inherit the problem. We conclude by reflecting on the apparent success of the ban,discussing implications for online moderation, Reddit and internet communities more broadly

[kaolti]

You think the platform from which hate is banned is a wide enough context to judge success?

I guess if you ban hate speech on reddit you will be successful on reddit. Do we think people who are banned take up religion and become good samaritans?