Even the high end unions have pretty big problems.

Things like the actors guild are simple rent seeking at the expense of newcomings. They are setup in a way where only insiders are allowed to get jobs at certain places, and there are large barriers to entry to becoming an insider.

If we were to apply this to tech, it would be contract provisions that keep out engineers that dont have degree, or discrimination against H1B immigrants.

And I don't want the tech industry to have contractual provisions that discriminate against these groups, and would be willing to spend a huge amount of effort fighting people who want to do that. (And based on comments that I have read on hacker news, there really are a lot of people who want to screw over self-taught developers, or immigrants)