I’m sorry, but this is a ridiculous take and you clearly have no actual insight into film crews (American or otherwise).
The standard work week for a union film crew in Los Angeles is 12 hours a day, 5 days a week. Often those days can stretch into 14-16 hour days. Crews regularly find themselves having to work a 6 or 7 day week and even holidays while on a project.
Without a union, crews would likely be working close to minimum wage for highly skilled and often physical and dangerous high pressure work. These jobs have almost no work life balance. The power imbalance between studios and their employees is massive, especially in regard to below the line crew.
The film crew’s union (IATSE) in one of its most recent contract negotiations, had to seriously fight to get workers a ten hour turn around- meaning that productions are now obligated to give film crews 10 hours off before having to be at work the next day. Studios and filming locations are often a 40min-1hr drive each way with LA traffic, so crews sometimes only get about 8 hours at home before they need to be at work the next day. That’s 8 hours to let the dog out, eat, shower and sleep before having to go to work the next day. And that’s only just a recent union win.
The union frequently has to fight the studios from clawing back healthcare and the members regularly accept very modest pay raises (3%) even during the last almost decade of high inflation. Only in the last contract was the crew able to get any sort of raise the reflected the rate of inflation but barely made up for decades of stagnant raises negotiated in the past.
To top that off, crews rarely actually get to see that full rate that is negotiated because studios have negotiated to exclude certain productions from the base rate. Instead, those exclusions get a discounted rate for below the line crew which many productions fall under (called roll back rates, which covers several tiers of movies, season 1 & 2, and it resets if the crew is replaced, streaming pays less into healthcare, etc, etc.)
Film crews in general (american and international) tend to be very hard workers. International crews don’t work any harder than American crews (I’m sure they work just as hard though), however their cost of living is much lower and the studios don’t have to pay healthcare because most countries that studios are filming in have low healthcare costs or some form of socialized healthcare. These countries that studios are bringing production to tend to have cheaper locations and often have huge tax incentives to draw in productions which overall has had a pretty big effect on the American film industry.
Crews make a very middle class salary in America but have to live in HCOL cities where the studios and filming hubs are. Many crew members really end up making a poor or lower middle class living because it’s an incredibly competitive industry and not always very stable work since crews are constantly needing to find the next job after their project has wrapped.
There are many reasons that productions are moving over seas. The union or the workers aren’t the problem here.