Has being in the news as an organizer significantly harmed your job search?
Software employers are not yet collaborating to avoid unions, as employers associations in other sectors have historically. There is not yet an organized blacklist for outspoken activists.
Unions are certified by card check or secret ballot. In either case, no future employer will ever know whether you supported unionization in a former job. You will always have plausible deniability, and its illegal to ask outright.
I hope you're right, but it's probably hard to know for sure.
My skepticism stems from the no-poach cartel discovered a few years ago.