Is it safe? Well, I only EVER use ethernet, cables, and a VPN (sadly like FB many sites now, despite ALL the recommendations to use a VPN, test for one, and will not let you login if you are using one, why? So they can track you, and sell you stuff, of course! )
Still, get this? Why did I switch off my WiFi and use only ethernet? Well, I bought an RF meter, and the signal from the WiFi router? Was WORSE than that from the smart meter…
Make up YOUR mind. Maybe YOU think this is all rubbish.