I'm not saying they aren't providing a valuable service to many people. They are to me. But they also have the potential to cause great harm to their users, and are very hard to hold to account, should they ever do that. So I try finding the one I distrust least, and use that.
I don't really see the parallels to 'nothing to hide'. It's just a bit of, in my eyes not entirely unjustified, paranoia.
The second. It's unlikely, but not impossible, for a vpn provider to be compelled to keep logs, either selectively or for everything.