What prevents anyone from spending utxos from a native segwit address?

What prevents anyone from spending utxos from a native segwit address?

I read that transactions spending utxos from a native segwit address ( an address starting with bc1) are seen as anyone can spend transactions by legacy nodes.

So what prevents someone from taking a utxo from a native segwit address and using it to fund a transaction with a scriptsig of OP_TRUE or null ,and submitting it to a legacy node or directly to a miner?

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