Have you actually read Google’s terms of service and ‘’’’’’’’’’’’’’’’’’’‘privacy’’’’’’’’’’’’’’’’’’’’ policy? Of course connecting to any Google service from any device whatsoever will result in losing privacy (read = your IP address will be logged, and cross-referenced with other Google products unless you’ve adjusted your privacy settings). There is no Sailfish-specific problem here. Jolla offers that possibility because they knew from the beginning that many people would be asking for compatibility with Google services (and they do - just look around this forum and you will see quite a couple of posts about perceived instabilities/incompatibilities with some GApps), not because they actually believe that interfacing with their services is a good idea.
Google is not a search engine (and even less a technology company), it’s a marketing company. It didn’t become world’s first company by being innovative, no matter how hard they (and many fools out there trying to justify their shady business practices) might want you to think that, but it did so by selling your data to third parties. It’s really that simple. Avoid them at all costs, in all your devices, ever. If you do use Google products, just search for alternatives - there are at least 3 good lists out there.