You would think that these platforms would have ways of challenging anyone that uses the platforms in order to defame or slander another, otherwise if it is reported or spotted that the platforms are being used in such a way. They know that the platforms are being used in that way, but they just allow it to go on.
Now political platforms are designed for political debate, and therefore everyone understands why they get on a political platform, and how heated political debates can get, so no one is confused or fooled by what they are participating in when they join a political discussion. Also they are allowed to face their political rival's with an equal opportunity to fight back.
Platforms like Facebook and others were designed and marketed as places where family and friend's can come together, share good times, photos, and do other things like buy and sell goods to one another, and even meet new "FRIENDS", but not meet wolves in sheep's clothing or stalker's etc. Facebook and other platforms have a duty to cancel accounts that are being used to bully, defame, stalk, and deceive others.
Political platforms are different, because nobody is under an illusion that they are there to be anyone's friend, and debates on the issues can become heated, and mud slinging gets to flying, but at the end of the day everyone accepts the fact that they are willingly participating on a political platform that doesn't give the illusion that you are at your local church or family dinner when participating.
Big difference.
The same with celebrities, where as they tried to mix politics with their career's, and made a huge mistake in doing so, because they betrayed their fans that support them as actors, and not as political hacks carrying the water for a political party, and especially one that is a very unpopular one to the masses.
Just me two cents worth.