Not sure where your information comes from but it is completely wrong.
Minimum wage for sea-farmers is controlled by international convention, and it STARTS at $1100 per month, guaranteed. This amount can not be withheld in part or in full, also this amount can NOT be tied to or adjusted by any shared gratuity or service charge.
This is dictated, managed, and governed by the United Nations International Labour Organization.
THAT is where I get my information, and that is how I know that the base salary doesn’t fluctuate regardless of the auto gratuity being removed.