Channels with absolutely zero drama that are still active and I would describe as " interesting content made by someone who cares about it" :
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cracking the cryptic: solving sudoku puzzles twice daily
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chessnetwork: explaining famous chess matches and occasionally playing online chess, but with none of the bro culture that has grown up around chess recently
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Folding ideas: great video essays about film or modern phenomena like NFTs
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Technology connections: already reccommended, but in depth explanations about how electronics work
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Language Jones: videos about linguistics and learning new languages
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Numberphile/StandUpMaths- interesting math videos