You are free to organize your own work crews however you please. Others may not be interested. Bitcoin & Lightning potentially make it possible to be paid by the minute. There are lots of reasons people might prefer that.

Slavery is force & coercion & should be opposed by force. Saying that hourly wages are a form of slavery or that "renting people" is slavery would suggest you believe they should be opposed by force.

If you want things to be voluntary then you advocate an anarcho-capitalist world whether you like it or not.

I could see socialists making the argument that your effort to place % based valuations of people creates an inhumane sort of heirarchy too. Your distinction between what you imagine as some sort of ideal & the wage rates that people agree to is completely arbitrary.