Off by default. When the creator turns it on, the fee itself opens high and decays: 80% of the tokens bought at second zero, falling linearly to the coin's fee by second 10, where it stays. A bot buying the launch block keeps little; a person buying a minute later pays the normal fee. The protection fee goes exactly where the normal fee goes.
With protection on, the bundled first buy still pays Doppler's slice of the opening rate: 5% of 80%, that is 4% of the tokens it receives. With protection off that drops to 5% of the flat fee.