Others have pointed out that tech workers are much more unionized elsewhere (other than US). There are probably multiple factors as to why there are few unions

Others have pointed out that tech workers are much more unionized elsewhere (other than US). There are probably multiple factors as to why there are few unions in US (ie. Comp in US is insanely high, tons of competition for workers, etc). But I'd argued that the main reason is: insane growth of US tech sector in past decades as compared to elsewhere in the world. This enables both higher comparative wages and competition for labour. Also consider that almost anyone can start a tech business (workers are the capital resources of a tech outfit - not machinery) leading to more dynamic labour market. But, I'm not sure this will continue to be true after backlash we are seeing against USA tech sector. Maybe that's why the conversation around unions is starting now.