Just need to make sure it’s not doing some phone home stuff after the fact, or cut it from ever reaching the Internet at all. I wouldn’t put it past any big corporation to be pulling that with the guise of the app being local and double dipping by selling data at a later date.

Linus Tech Tips did a good job exposing Anker for doing this with security cameras that were supposed to be local only but were found to be uploading pictures to their servers.