And true, the service is only good if Fanng/Fortune500 employees signup. I agree, its only a bandaid because Faang needs to step-up to solve this.
I think the only reason I added Login with google is that it's frictionless, just to enable users quickly setup accounts.
Make it a paid service. It's the only way it will work. People may be willing to spend a few minutes of their weekend or evening to help when it's a front-page post on HackerNews, but nobody will voluntarily waste their free time helping strangers at an industrial scale on what will end up being 99% stupid issues.