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Some (private) rocketeers provide live views of their space endeavors, while other (government) rocketeers give you animations.
The times we live in...

You get that's just a "preview" right? It's in the desc. It was done & shown before the launch, and I assume you knew the launch date (granted, it was postsponed several times, so admittedly not easy to keep track unless you have a passing interest about it). The actual live broadcast is at: https://youtu.be/7nT7JGZMbtM

You're absolutely right, my comment should have targeted the live launch, sorry.
Still, that covers about 20 (shaky cam) seconds of the launch before they switch to an animation (!) of the launch.
Which brings me back to my original gripe: The Ariane 5 is an old vehicle which doesn't have onboard cameras. Private rocket launch companies have eclipsed it. And I think The European Space Agency is not keeping up.
As to cameras on the JWST itself, it looks like they didn't attach any for a reason: https://www.space.com/james-webb-space-telescope-no-cameras-reason
Didn't know that...