I do not see the really problem about this. Why should it be a problem to give personal details, if there is nothing to hide? For sure they will not share any information with others.
LOL.
When you give away a data, you can rest assured this will be used against you, sooner or later.
It's not if, it's when.
And even if you trust the counterpart you give ypour data to, they can lose the property of your data, trough hacking, government actions or even corporate acquisitions.