What is the largest OP_RETURN payload ever created? When it comes to pushed bytes after the OP_RETURN, not when it comes to whole transaction measurement, and never when it comes to quantity “burnt”. Additionally simply the payload itself, so excluding the information push op codes (e.g. OP_PUSHDATA4 ).
Since this will probably be a non-standard transaction, there are two classes: the most important IsPushOnly() and the most important !IsPushOnly(). See Why do normal OP_RETURN outputs additionally should be IsPushOnly()?
I am curious if the latter is used in any respect, however my query pertains to the previous. That’s, one thing a miner can create by setting -datacarriersize and optionally growing MAX_STANDARD_TX_WEIGHT and no different patches.
A further distinction could possibly be made between the most important coinbase and non-coinbase OP_RETURN.

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