Fabs tend to be the kind of workplace where certain optimizations regarding employment law don't work well (i.e. no hiring everyone as contractor)[0], and that

Fabs tend to be the kind of workplace where certain optimizations regarding employment law don't work well (i.e. no hiring everyone as contractor)[0], and that means dealing with employment law that has no concept of "overtime exempt" and often strong requirements on things like "maximum hours per week including overtime". [0] Hiring as permanent employee vs fictitious "B2B" contracting can have different trade offs to employer, and while the later is cheaper in terms of wages, things like due diligence or contractual responsibility to customers/suppliers might be easier with permanent workers.