If you’re looking for something you can carry about and use to store data on, why not just a USB-C thumb drive or external SSD?

Edit; this is intended for photographers, but you can get external SSDs that create their own WiFi network so you can transfer files wiressly to and from them: https://www.westerndigital.com/en-gb/products/portable-drives/wd-my-passport-wireless-ssd?sku=WDBAMJ2500AGY-EESN

It’s not necessarily about a threat to instances or users. It’s more an issue with how Meta could potentially hijack the protocol the whole thing is built on, and do damage in the long run. There’s a write up here on how similar things have happened in the past;

https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html