That'd be quite expensive. And as you manipulate prices across blocks, arbitrageurs would arb it back to "market price". Uniswap V3 allows for a 3rd party smart

That'd be quite expensive. And as you manipulate prices across blocks, arbitrageurs would arb it back to "market price". Uniswap V3 allows for a 3rd party smart contract to ask its Uniswap V3 Oracle to employ a 9 day moving average price - which is of course, not very useful as a "spot price", but is super hard to manipulate.