Thanks for the heads up!

I'm 5% concerned about QC I'm 95% concerned that Bitcoin does not become a widespread medium of exchange

Don't clean it too much you lose the flavor

Lightning Network is quietly becomming where commerce and exchange happens, but you can't tell because it's impossible to know how much volume is being transacted on there. Each channel can be used millions of times in each direction with a single onchain transaction

If someone is going to pay a terrorist to detonate a bomb with an onchain transaction do you try to prevent that transaction from being mined? Or do you persue an avenue of terrorism prevention off-chain?

However the point about making Bitcoin more moral with blocking "spam" has no basis because there is no consistent definition of what constitutes a spam transaction. Is it more moral to block a transaction containing the original version of George Orewells 1984 amidst attempts to rewrite it? The point of Bitcoin is to maintain and enforce the truth and not to take a position on morality

No I am in absolute agreement that you can block whatever transactions you want for any reason with your own node.

What are some examples of said methods?

All of the ones Satoshi added are definitive, there is no question around 21 million or what constitutes proof of work. "Spam" however is defined differently by everyone. This is why it won't work.