"The International Workingmen's Association (IWA), commonly known as the First International [...] was founded in 1864 [...] The preparatory Address of English to French Workmen, drafted by trade union leader George Odger, articulated the need for international cooperation to prevent the importation of foreign workers to break strikes:

A fraternity of peoples is highly necessary for the cause of labour, for we find that whenever we attempt to better our social condition by reducing the hours of toil, or by raising the price of labour, our employers threaten us with bringing over Frenchmen, Germans, Belgians and others to do our work at a reduced rate of wages [...]"

Software work appearing to be extremely fungible with offshoring and AI is all the more reason to unionize. It doesn't matter to the employer who is doing the work, so the union is the only leverage to truly saying, "hey as the person actually doing the work, I would like to be treated better, and you can't just ignore me, fire me, and replace me".

The race to the bottom already started as soon as companies saw more fungibility where there was less before. Software unions won't kick that into overdrive, they'll slow it down.