6LoWPAN has a variant that can use Bluetooth Low Energy (rather than 802.15.4) to carry IPv6. See https://openwrt.org/docs/guide-user/hardware/bluetooth/bluet... for instance.

Isn’t that just WiFi with extra steps?

BLE gets most of its energy efficiency from aggressively turning the radios off when they’re not in use. Wifi can do the same thing, and protocols like Thread are pushing in that direction.

The big issue with a BLE to interwebs gateway is that you means you need to handle routing etc. Which starts to erode the benefits of using BLE in the first place.

I'm more talking about being able to exchange messages across continents without offering somebody full TCP/IP access to your network. Your point is valid though

Also for txt messages other BLE to another RF device such as GoTenna is pretty cool!