They are copyright infringers.
Bill Graham thought he owned and could control anything having to do with music in San Francisco.
Seems these guys do too.
Maybe in another 80 years people who were never there will want to listen to them when they become public domain.
Just like today’s audiences are mad for Rudy Vallee recordings.
Another thing to consider is that Bill Graham was a very shrewd man who owned the venues, promotion company, and sometimes management company for these performers.
He may have had some extensive release agreements within his contracts he had the performers sign.
Additionally, these are not typical “walk into a show and video it with an iphone” clips. They are 2 (or more) camera setups with cameramen onstage and in the front row and elsewhere.
His earlier shows utilized a couple cameras on tripods.