I too declined on privacy grounds.
I think my account was active for 10 minutes when it got blocked due to "suspicious activity" and locked. All I have to do now to activate is give them more of my information including my phone number.
I've had this same exact thing happen with Facebook and Instgram too. Facebook was probably no less than 5 years ago so this is not new. You can usually confirm your identity (which they do not know), using your phone number (which they do not have). Read that again. :) They ALL do this.
The kicker is you will not find any sympathy because they start with jurisdictions (3rd world) where they can get away with it and people will lecture you about how you must have done something because Facebook never asked for their phone number or blocked them.
I had Airbnb ask for my passport 10 years ago ffs and I did give it and they still didn't want to give me the place until the proprietor intervened and sorted it out. I had the same exact helpful comments about it online that I described above. "You must have done something", "You're full of shit, they don't ask for passport at all".
This attitude by my "fellow men" is what bothers me most about this whole thing.
And now it's global, the same people will probably go "what do you have to hide", "you show your passport at the border don't you?".
I usually say "great, can I install a camera in your bathroom? No? Do you have anything to hide? This is what it feels like to me."
Having said that, I've noticed most resumes I receive have GitHub links over LinkedIn. We've advertised on LinkedIn with mixed results, employee referrals have always been more effective.