I'm not sure why, most D&D series I've watched on youtube all take themselves very seriously, with few instances of wacky hijinks.
Fishmalks are the reason ...
In WoD setting there is clan of Vampires (Malkavains) that are all crazy ... and you can play it any way you want ...
There is usualy one group of people who actualy know something about vertain mental illness witch their character express ...
And then there is other group of people who thinks that corectly played Malkavian is just like cartoon Harley Quin ... where nothing they do makes sense and they are often chaotic just for the purpose of being chaotic.
First group hates the second one ... and since people tend to often tell people "how are they suppose to play" ... this was source of many argues.
In the time people started using therm Fishmalks for theese chaotic players.
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In my experience many people are therefore affraid to do something funny or crazy, just bcs they dont wish to upset others and they dont know what amount of silliness would be apropriate.
So they choose none ... wich is boring, but safe.
Then there are people like Taika Waititi ... who dont give a shit about this and just spam their screenplay with caddence of 1000 jokes per minute.
And it easily can become disruptive, unorganic and quite honestly anoying. :-/