Mindshift and Kristi Burke both do interesting philosophy/ex Christian videos. So does Genetically Modified Sceptic, although he’s closer to 1M.
Rational Animations has really interesting animated stories about AI safety. Robert Miles also makes quite frightening videos about AI safety.
CodeParade makes interesting videos about game dev with weird geometry and also maths.
legomasta99 and Pinu both have cool Minecraft videos in different ways, although neither have uploaded much recently.
Salmence is a popular Stardew Valley YouTuber.
Well, the human can consent, so that would make it perfectly ethical if they do.