Just to provide some perspective on the Nordics claim, since I'm Norwegian and worked in a phone store for six years. In my experience, practically no one here uses Whatsapp, except for communicating with people in other countries. It's either Facebook messenger, Snapchat or SMS/iMessage.
I'm trying my best to be objective, and while I do admit I am not without fault, I have not seen what you are referring to. Are you sure you're not misattributing anything? Sympathy for Palestine does not equal defending Hamas' actions. I have yet to see a single post defending Hamas or their actions on Lemmy. I have, however, seen a lot of condemnation of Israel's actions. Maybe I am mistaken, but I believe you are conflating the two.
Just to clarify; It doesn't necessarily mean that your Google account password is compromised. It lists data breaches of services where you used the provided email to register. The password you chose for that service at the time of the breach has been compromised. If you don't use the same password everywhere, or changed your password after the breach, your other accounts are not compromised.
Also, as OP said, use two-factor authentication. And please also use a password manager.