I know they will never do it. However I cannot help think having a twitter with only non anonymous verified identity would be nice. Personally I don't have special interest speaking with people that want to be anonymous when I use Twitter.
I also don't like anonymity, but some people might need to remain anonymous for safety reasons. Those living under repressive political regimes, for example. They'd need anonymity to get their message across.
There's no way for social platforms to tell apart which anonymous users are "good" or "bad"...
KYC wouldn't help against state actors, which are the offenders with potential to cause most damage. They're the issuers of their national IDs in the first place, it's useless to verify their ID.
Adds too much friction and scares away those who want anonymity.
KYC works for financial institutions because it's regulated across the board. And let me tell, it's a pain.