It doesn't work on a per-shift basis. If they work a slow, below-minimun weekday and a busy, above-minimum weekend, they aren't bumped up on the weekday. What actually happens is their weekend is counted against their weekday. Many shifts they do in fact walk out with sub-minimum wages that do not get corrected.

It's a system that's great for the rockstars is busy urban areas pulling in hundreds of dollars a shift. For everyone else in the industry, not so much.

"But overall they're making above minimum."

While true, it's similar to a laborer working a 12 hour shift and not getting any OT because they're under 40 for the week and OT doesn't kick in until hour 41. They still worked a 12 hour shift and 4 of those hours should have been OT, but due to how the hours are counted their employer is able to avoid the payout.