Because OP_RETURN was specifically designed for that, and I (subjectively) feel that up to 80 bytes here and there that are included in the block and pay the full fee is reasonable.

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No, it wasn't designed for it

What for, then? 🤔 I always thought that OP_RETURN was for arbitrary bytes.

Apparently it was to burn bitcoins but you’ll have to be crazy to do that. https://en.bitcoin.it/wiki/OP_RETURN

OMG Thank you for your donation guys 🫡😂

Smart contracts. It indicates the transaction spending is invalid.