@codedbydan generally speaking, for two reasons
1) tech workers have deeply bought into the meritocracy and collective bargaining feels counter to it
2) it feels super hypocritical to claim you are getting exploited when your comp is well into 6 figures
Pretty easy to manipulate people into feeling masters of their own destiny and more like they deserve those comp numbers, if they avoid a union. Ignore those folks over there that are actually exploited, the meritocracy says they deserve it
Again, the above is generally speaking