there is no "standard". it's literally a configurable setting. there is a default in core which is 80. and there is a default in knots which is 40. in both cases the user can set whatever they like.
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Per @Laser : Core… has had 80 byte OP_RETURN for nearly a decade now. 85%+ miners have been set to 80 bytes for the same amount of time. Read the commit log. Read the bitcoin-dev mailing list.
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bitcoin/src/policy/policy.h at master · bitcoin/bitcoin
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That's called centralization, and is exactly what OCEAN exists to combat