Crazy idea to fight spam (hear me out/critiques welcome):

The main ways to broadcast arbitrary data are op_returns, witness data, and fake addresses in bare multisig right?

What if we hard fork with the following changes:

- remove op codes that allow arbitrary data

- deprecate multisig in favor of musig

- change the witness discount to a 10x witness premium

- implement cross signature aggregation to incentivize efficient witness usage

Does CISA destroy the ability to add arbitrary data? I dunno, just spitballing here.