1. Depends on jurisdiction
2. Depends how far the company would go to "play it safe" regulations-wise
3. Some platforms provide more service than others
Bonus point: depends on how 'evil' and sort of disrespectful a company is in terms of privacy
I do find it odd that they are asking for more, I mean Facebook and Amazon are global companies but they don't ask that much for a KYC, I am sure that they are the 4th one that @mk4 is pertaining too.