There are reasons to tolerate spam in the blockchain: ejecting it requires a large amount of hashrate, and the cost is too high
But the same reason does not apply to the mempool: ejecting most of it is easy, and the cost is low
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There are reasons to not allow spam in the blockchain. Bitcoin is valuable because its Money. Shitcoins are not valuable because they are memecoins, fartcoins, turdcoins and so on. So if miners want value for their block rewards its in their interest to not devalue Bitcoin with spam.