Oh boy.
Alright I'll discuss this
First you say: what do I have to hide?
Well if you have nothing to hide, may I ask for your username and password to all of your various accounts?
Your bank account and email in particular.
Or your search history, would you mind sending that to me?
How about giving me live access to your location?
You could very realistically and easily do any of these things, but I'm going to guess you won't
Because even if I have no ill will towards you that's not something you just share with anyone who asks.
However the vast majority of people who have access to this information never asked you, and anytime laws are proposed that would stop them from collecting this information or that would restrict what they can do with it, they fight like their lives depend on it.
So here's my second question? If that information isn't important and doesn't impact your life: why is selling it a multi-billion dollar industry?
And yes it does impact you.
Anything you buy with debit/credit card is recorded, insurance agencies will charge you different amounts based on what they find there.
The thing is we have no reason to put up with this, it's not hard to cut 70-90% of that information gathering out of your life withthout a single interuption in your day to day life.
I can keep going for 2-3 pages about all the ways various actors, both governmental and corporate, are spying on you and collecting information you wouldn't give to your friends, but I think I've explained the basic reasoning behind it.