That's about government. As I said, you can turn off all the tracking and lie about all the questions they ask, you can use guest mode, whatever you want, it's not really a problem if you care.

And your DOB isn't massively personal information, get a grip. Not like they're asking if you believe in the state religion, who you voted for, are you loyal to the party, which of your friends you have suspicions about, do you have more than 1 child, do you love someone of a different religion, have you seen anyone with more resources than they should have, is there anyone hiding in your attic, etc etc