That's really only useful to a small number of users, relative to the overall size of the economy, and many of them are doing things that aren't legal. Not a market I'd probably target if I was going for mass adoption.

Anonymity is something people give up without knowing. If all cryptos opted for default privacy, things would have been different.

With bitcoin, merchant you make payments to can potentially find your wealth, or another can deny transaction to you bwcause you donated somewhere.

These are not doomsday scenarios, this happens today and will happen more if we do not choose privacy.

Gambling and porn are both quite popular.