Undercutting EU3+US3 prices sounds good for the customer. However, they were losing money even before Covid-19, so their prices were somewhat too low for a break even. That is not sustainable and the result is an airline which is almost extincted and lots of employees losing their job.
Complaining that the EU and US carriers did charge more for the same routing does not help, as it looks like one needs to charge more for covering the costs.