Yeah the distributed nature of tech makes unionizing naturally difficult - multiple offices with different reporting chains, remote teams, etc. The way CWA handled this for Alphabet is a sort of fake "PR" union where the company is under no obligation to bargain with you and you don't really any of the protections.

An app could maybe help here as well to define more viable bargaining units - like "the QA team" rather than the "NYC Office" which may have thousands of employees with different eligibility and reporting chains.