First of all, I have had a similar experience
That's the point. We all have. The thing is that even if you do read the terms and conditions, you kinda have to agree. If you want the many benefits that Google or Facebook or whoever provides.
And most of us want the benefits.
even if you had read, in the beginning "we're gonna collect data on you" (very polished, of course), chances are you would have agreed. I recently renewed my passport. The lady took my picture, scanned my ID and then asked me to give my fingerprint. Now, I know this is pretty common abroad, but here, it's a relatively new thing. I was shocked, it's something I've always hated, the idea that the state now has my fingerprints.
But I put my finger down, in the end. I wanted the passport.
Thank you :)