I think if Youtube requires someone to post up a video, complete their Youtube profile information like the "about me, fav books, and movies section", upload a profile photo, or complete a tasks before they can comment or PM people there might be fewer trolls and spammers which post on people's videos and channels.
I notice almost all of the troll and spam comments I get on my channel come from Youtube members who have an empty Youtube profile with no info about themselves, or just an avatar picture uploaded to YT.
It is also very rare that a troll or spammer uploaded any videos in my experience.
If youtube requires people to post up a video, or at least, fill out their profile info then I feel many trolls, flamers, spammers, and scammers will no bother being an member of YT like how spammers on forums tend to give up spamming when they have to post 5 replies or topics before they can post website links.
I notice almost all of the troll and spam comments I get on my channel come from Youtube members who have an empty Youtube profile with no info about themselves, or just an avatar picture uploaded to YT.
It is also very rare that a troll or spammer uploaded any videos in my experience.
If youtube requires people to post up a video, or at least, fill out their profile info then I feel many trolls, flamers, spammers, and scammers will no bother being an member of YT like how spammers on forums tend to give up spamming when they have to post 5 replies or topics before they can post website links.