WHITE TO MOVE] A difficult move to find : r/chess

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Molded Large Chess Set

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This was rated as a 2800 level puzzle on chess.com, but isn't the move a little too obvious to be a grandmaster level puzzle? Am I missing something? : r/chess

Is it just me or do the puzzles on Chess.com not make sense a lot

This puzzle is rated 4000 on chess.com and has a 100% fail rate

Crazy 3000 rated puzzle! Find the continuation that results in checkmate for white (White to play) : r/chess

Lichess puzzle ratings are completely puzzling. For example this is rated 1813. I would expect a complete novice to solve this. Whereas I've seen mate in 6 with brilliant moves being rated