Fear. Fear of yet another vector that Google could use to connect the dots of their life.

Belief that Google's business model is incompatible with security/privacy.

Unfair criticism that Google will just shut down any service/offering once they get bored --- it doesn't happen to pay services.

The majority here don't talk about security. They talk about privacy. Google's business model is incompatible with privacy.

I'd agree -- privacy is the right term here.

Privacy is an integral part of security. The terms have just become disassociated due to those who use the refrain of "security" to mean their security at the expense of your security - eg airport molesters.