We mostly know these from YouTubers that are big enough to have terminally online fans that send them the juicy but relatively unknown mysteries, or are themselves terminally online.

I can provide you with a list of channels if you wish.

Took me 20 min :

Way to high quality for YouTube videos :

https://youtube.com/@lemmino

Relatively small channels :

https://youtube.com/@sombertoboggly

https://youtube.com/@shaiivalley

https://youtu.be/EqKPERlC0mg

https://youtube.com/@theinternetinvestigator

The really Big  :

https://youtube.com/@barelysociable

https://youtube.com/@nexpo

https://youtube.com/@nickcrowley

https://youtube.com/@blameitonjorge

https://youtube.com/@justinwhangyt

https://youtube.com/@scaretheater

https://youtube.com/@parallelpipes

Japan specific:

https://youtube.com/@kyotorobato