Apparently the ban was because he was reading off the names of people who sent in Bar complaints against him [purely harassment complaints for his political views, not clients] and Youtube treated it as doxxing. However, those are public records, not private.

That is generally not a defense on social media sites, unfortunately.

In my experience as a lawyer, suing Youtube would very likely cause them to just dig in and leave him banned for years while he litigated the case and almost certainly lost (even though he should win) because judges are super deferential to social media companies at least until we get state laws turning the tables on them like we are seeing in Florida and Texas.

What of the Berenson case against Twitter? Is Twitter more vulnerable because it's not making any money?