Having said that - tech workers could achieve a whole lot through collective _struggle_ (of which bargaining is just a part):
* They could prevent mass government surveillance
* They could force companies to share their patents and other "intellectual property" with the rest of society, for the benefit of everyone.
* They could link up with other workers in areas such as the SF bay to force the government and tech companies to finance construction of public housing and limit rent.
* They could mobilize and lead struggles for getting corporate money out of politics (well, at least the direct kind of money in politics).
... and of course take care of their own interests in the form of participation in company decision-making, protection against arbitrary terminations, equitable pay scales, less excessive work hours etc.