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They are using block space for cheap advertising, displacing hundreds if not thousands monetary transactions with non-standard op_returns, probably to troll node enforced policy rules. They might as well mine empty blocks and people will still find ridiculous reasons to justify their adversarial actions.
I should’ve added “cheap advertising that no node runner wanted, needed or agreed to store on his disk forever”.
I'm a node runner.
Based on the configuration settings I set for my node I'm agreeing to store the full block chain of data. I'm also relaying blocks to peers requesting them.