Spam is not a thing. At least we're being honest now.

You could REDUCE "spam" however defined (along with non spam) by eliminating op_return.

You could also reduce the block size, making transactions more expensive.

But without shouting and endless pointless arguments, I think that's pretty much your only options.

Knots and filters won't accomplish dick other than being annoying and helping lukedashjr market ocean pool.

Lol, (just realized) by that criterion filters ARE the spam!