Germany here, also problems accessing the mobile networks in (some) supermarkets.
When some years ago I found my erstwhile phone to behave suspiciously after having used the wifi of the hotel where I had been staying, I became extremely careful with public and semi-public wifis, too, though, and I wouldn't even call it paranoid. 😉
But I guess that's what VPNs are for... Until now I didn't bother to create a VPN endpoint in my home LAN for that purpose (it's still on my wishlist because it obviously would also allow access from everywhere to all of my home LAN resources without furth