Sorry for the long-winded explanation, but first let's look at Google's ToS:
How do the Terms of Service affect me?
As our Terms of Service state, "You retain ownership of any
intellectual property rights that you hold in that content. In short,
what belongs to you stays yours."
We do not claim ownership in any of your content, including any text,
data, information, and files that you upload, share, or store in your
Drive account. What our Terms of Service do is enable us to give you
the services you want — so if you decide to share a document with
someone, or want to open it on a different device, we can provide that
functionality.
You control who can access your files in Drive.
We will not share your
files and data with others except as described in our Privacy Policy.
We will not change a Private document into a Public one.
We will not use a Private document for marketing or promotional campaigns.
We will keep your data only as long as you ask us to keep it. You can take
your data with you if you choose to stop using Google Drive.
Paying particular notice to:
We will keep your data only as long as you ask us to keep it. You can take
your data with you if you choose to stop using Google Drive.
and:
We do not claim ownership in any of your content, including any text,
data, information, and files that you upload, share, or store in your
Drive account
I understand you do not like their security concept (but just wanted to clarify it) and their ToS, and 'Privacy Policy'.
Refer to my answer here. If you want to own the data, you need to house the data. Enter, OwnCloud.
Privacy Policy
We recognize that privacy is extremely important to our users. We do
not share individual user data with third parties without your
permission.
Backed up with user access control(s):
Fine-grained control over access to data and sharing capabilities by
user and by group.
As advised, the guts of my reasoning is in my answer here.
