No it is not. The IT sector is one of the highest paid in the world, and there are so much possibilities to choose from, that no agreement between Google, Apple, Microsoft or any other can keep the salaries low, which they are not.

When going the union way your give some of your freedom. You don't have freedom to negotiate everything yourself on your own terms based on your own needs, knowledge and value. No one knows better than you what your needs are.