Maybe the news about the Windows client changing DNS settings was too much bad publicity?

A VPN would naturally route all your traffic through a secure tunnel, but you’ve still got to do DNS lookups somewhere. A lot of VPN services also come with a DNS service, and Google is no different. The problem is that Google’s VPN app changes the Windows DNS settings of all network adapters to always use Google’s DNS, whether the VPN is on or off. Even if you change them, Google’s program will change them back.