For starters what you can personally do is not purchase or use services from companies you feel are unethical. Explain to your network why for example you won't use Uber or Reddit or whatever other company you're fed up. If you can get enough other consumers to see from your view you'll force these companies to change. This just recently happened with health food junkies, now we have McDonald's at least paying lip service to healthy eating and serving things like kale.
One thing that won't work if you're a tech outsider is shaming people who work in the industry. It's hard to collaborate with people if they feel your tone is hostile.