I am a bit old, and never got why so many people watch "actual play". I've done it once or twice to get the mechanic of a game, but found the experience more technical/boring than fun.
I get having a guest or candidate player watching an in person to see how rpg work, or whether they click with the group, but somehow watching video of strangers playing RPG doesn't sounds fun to me. But I might miss something considering how popular these actual plays are
The only actual play I've ever actually found myself enjoying is oxventure, they're not the best example of a proper actual play though since they usually don't follow the rules too closely and are more of a fantasy improv group vaguely using 5e rules, sometimes blades in the dark or SWADE Deadlands.
Although I've only started listening fairly recently and haven't gotten up to the Deadlands stuff yet.