If you use Google Hangouts with SMS support can Google read your text messages? I want to know if other people also have concerns about Google Hangouts SMS privacy.
I wouldn't be any more concerned than when using the Google provided messaging app. At this point hangouts SMS functionality is simply as a messaging app replacement. There is no provision for message syncing or anything like that.
Technically speaking, I'm sure any carrier/service provider can read messages sent to and from the device, if they really wanted to. I don't think it's an issue to worry about.
Google has had access to my SMS for years since I've been a Google voice user. I'm fine with it from a privacy point of view.
I'm a gmail user too with many accounts attached it. They've never hidden the fact that they use keywords to give me targeted based advertising. Apart from that I don't believe they use the data for anything other than that.
If one uses any Google services you need to understand that and agree with it.