I propose to ban all types and forms of work for free, except work for the socially disadvantaged.   This is because unpaid work violates human rights to the extent that most such work is the result of the fact that paid work is not available and the employer has no obligations to such workers.
In addition to bordering on slave labour, this type of work can also be considered as undeclared work. It is not taxed by the Treasury and can be considered as informal economy.
Unpaid work is also uncompetitive with other labour providers and smoothly ignores any competition clauses.