Wireshark lets you capture packets, so you would see all of the raw traffic in / out of your PC. It requires some learning, but you could probably recognize personal info in the raw packets, if there un-encrypted. do a capture, select an HTTP GET in the lines of raw capture, and within the wireshark menus, select Analyze->follow->HTTP Stream. That is the quick version.
I'm creating my own that integrates with multiple services. But part of that was seeing what is currently available and honestly I really really like Bitwarden's way of doing it. Decryption and encryption is all done via clientside and due to that, all shares are encrypted with a unique passphrase. https://bitwarden.com/blog/bitwarden-send-how-it-works/
Theoretically the Organization Validated and Extended Validation certificates are great ideas. The problem is that the process is slow, requires a lot of effort from the holder. And that these SSL certificates were expensive in a time where security got more mainstream attention and push.
Practically 95% of the users don't care or understand the difference anyway.
So Let's Encrypt happened! Free domain verified certificates backed by major players in the market..
That's what's enough for the majority of the sites on the Internet anyway...
Nobody has answered this, so I'll put some thoughts.
If it is WiFi geolocation, that works by various surveying techniques seeing WiFi MAC addresses in the wild.
Chinese network devices with uninitialized MACs or MACs from some other manufacturer's space are not uncommon, and most of the devices I've purchased on places like Aliexpress or DX.com come that way.
Most likely either your device shares a MAC with a device in China. Go check on one of the many OUI lookup tools and see if your friend's MAC address matches who you think made the device. If so, the MAC in China is a likely clone, if not yours is also likely an invalid MAC and they just conflict.
Either way, the installed firmware may allow you to change the MAC to a randomly generated one if you want, if not OpenWRT is recommended if your router supports it. If anyone in the household's cell phone is set to send location info to google or apple you may find that your location may change over time, but you may have a back and forth fight with whoever else is using the same MAC.
Now, if IP geolocation shows you as in China, you're probably owned. ;-)