Lately, when I bring up Google on my iphone, I get this message:

[usonian]

4. You might have a neighbor whose computer got malware and is part of a botnet.

Or router. Some have recently been hacked.

They would be on your same general network if you are on wifi and cable.

Google's hacker protection software probably just looks at the network numbers your isp handed out rather than each device on it.

See if switching to cellular only changes anything. Might run up your phone data charges if data is limited.

PS I never use Google. They track all your searches, never forget, and gleefully sell the data to anyone.