The message you are getting from Google indicates that a link to a message/photo on Gransnet is potentially harmful. There are thousands of links posted by Gransnetters, goods and service providers daily. Google are showing you that they are keeping you safe! Good for them except it shows how closely your Internet use is monitored.
I agree with B9exchange, change your browser and search engine. Don't put all you safety concerns in Google's basket.
(Browser - allows you to get on to the Internet- a bit like allowing you into a world-sized market place.
Search engine - you use it to find what you are actually looking for.
The browser and search engine can be from different providers and needn't be Google. Some allow more privacy than others. B9exchange has listed a few - Apple own Safari browser and search engine.)
Don't neglect your device's security settings.