I dislike spam in Bitcoin, but relay filtering is symbolic unless miners enforce it. Nodes dropping txns doesn't prevent inclusion; direct submission bypasses relay. Is there any real change possible here without a consensus rule change? Answer: No.
As long as a transaction is valid by consensus rules, any miner can include it. That’s Bitcoin’s anti-censorship design working as intended.
Relay filters might save some bandwidth or express disapproval, but they don’t stop data from being mined. At best, they delay it. At worst, they centralize incentives.
To truly prevent a class of transactions (e.g. spam, inscriptions, BRC-20…), you’d need to change the consensus rules — i.e. redefine what is valid. But that would require a hard fork.
Bitcoin's neutrality means it doesn’t care why you're transacting. If it’s valid, it’s valid.
Relay filtering policies only provide the illusion of control. Without miner enforcement or consensus change, they won’t fix the problem.