It's absolutely a conspiracy theory. The 5 day work week has a historical basis and it has nothing to do with 'keeping you from a side job', nor do most manage

It's absolutely a conspiracy theory. The 5 day work week has a historical basis and it has nothing to do with 'keeping you from a side job', nor do most managers concern themselves with these kinds of issues whatsoever - other than leaking company IP or working for a competitor etc. - but those are knowledge worker issues that having nothing to do with most jobs. The conspiracy theory doesn't even make sense considering the vast majority of jobs are things like: 'truck driver' 'school teacher' 'nurse' 'construction worker' 'accountant' 'retail banker' etc..