Benefits: See what happens in hellholes like Russia and pretty much all Islamic nations when you criticize the government or religion. Being put in jail for expressing your opinion is wrong and this is why freedom of speech is a good thing.
What do you hate most about banning and censorship on free speech platforms?
What platforms are you talking about? Because Twitter, Facebook and YouTube are all run by private corporations and they all have terms and conditions you must abide by if you want to use them. This has nothing to do with free speech. The state you live in gives/doesn’t give you the right to free speech, but that doesn’t extend to corporations being forced to host your opinions.