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This is one of the best explainers of what OP_RETURN is and how it came about. It was always limited by filters and the filters are effective even though they are sometimes bypassed. https://blog.bitmex.com/dapps-or-only-bitcoin-transactions-the-2014-debate/
Well, that's a good post, but unfortunately it's off-topic since it doesn't answer or try to answer the question in the original post.
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