If you need non pruned node, you will store spam regardless of how it's encoded. Your node would be slower though, using a larger data structure is more computationally complex.

Many people can run a pruned node.

Op_return spam vs utxo set spam - clear winner for op_return in both cases.

Mining pools that get more btc from fees will gain hashrate, not lose it. From the off band tx they will include only those that pay more than those in the mempool. And since you can mine each block anonymously, it doesn't matter for them.. If I have a miner, I want most sats per hashrate.

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0.01% of revenue now is by fees, miner wants just the coinbase.

All bitcoiners who have a powerful ASIC choose non spam mining pool.

Everyone else miners thinks More spam=more blockchain problems=less btc value.

No one wants spam neither miners....I hope

Nope, spam censoring pools are in a minority. Fee revenue is low now because the blocks are empty, but it can be significant source of revenue for the miners, check may 2023 at the peak of spam activity.

Some blocks had more in fees than coin subsidy and miners happily mined spam to collect the fees. It would be irresponsible for revenue not to.

In a way, spam solves the security budget problem :)

Today offchain transactions are the majority, lightning, custodial services, ecash, fedimint.

I hope layer 1 will never reach that kind of fees.

Miners will be on the right side...I hope 😁