It’s the standard these days across many countries, many carriers have now built the cost base around the cheap crewing model, which is all about reducing cost, exploit regulatory loopholes, optimise taxes and keep crew at a distance. Norwegian was atrocious for that, Ryanair is another. Locally we have Jetstar International playing in that space, you fly from Sydney to Honolulu, the crew in the cabin serving you will likely be from Thailand, Indonesia, Japan. Depends how far one wishes to push the boundaries with local employment and immigration laws, I recall Norwegian ran into some trouble with the Americans who started having a look at its dozen odd crewing subsidiaries across its many AOCs. They quickly started hiring a whole heap of American based crews.
The model could be justified by operating routes to say Japan or Thailand, in which a local based crew is needed due to the language requirement. But that isn’t the intention generally.
Your next flight could have cabin crew from a mixture of nations, on a whole range of different agreements working for all sorts of subsidiaries, all on different rates of pay.