Miners decide which transactions are "pollution" and which are not. Not you, and not the parent. Seriously, who are you to tell anyone what data is "pollution

Miners decide which transactions are "pollution" and which are not. Not you, and not the parent. Seriously, who are you to tell anyone what data is "pollution" and what data isn't? Like, do you go around to people on their laptops in cafes and tell them to delete their files off the Internet because you think they're wastes of space? EDIT: Having a bespoke data field (OP_RETURN) in a Bitcoin transaction is an improvement on this front, because it provides a cheaper alternative to people storing the same data encoded as potentially-spendable UTXOs.