It doesn’t make it better for them to earn less, and a union is one way to group high and low skill labor pool such as the whole can have a better quality of life.
If you're in a bind and need a job, you get placed quickly by one of the firms supplying contractors to the large companies. Since you're in a bind, you accept making a lower salary, which ends up being around 60-75% of the base salary of a full-time employee without any of the other benefits of being full-time.
It is definitely better for some workers to make more than other workers. Is this really part of the argument in favor of unions? I always thought this was an anti-union straw man argument.
No, that isn’t obvious at all. Well it probably is relatively low skill for programming - because it’s HCL - but the reason it’s that low because this is indentured labour. Wipro, Tata even IBM are all in the same game.