Wouldn't it be better to attack ETFs as there is no technical non-subjective definition of spam and the only filter that selects for less spam-like transactions is fees?

The real threat being custodians effectively reducing volume on chain which opens the door for this band-aid fix.

Could we estimate what the fees would have been if all ETF volume were on chain this cycle? Would this have been enough to filter spam?

What about lightning maybe we adopted too soon?