> During the brief period that open Airdrop / bluetooth file transfer was a thing, there was a short fad of spamming porn to nearby people on public transport. So that was the end of that.

My recollection is that the end of that was Apple's worry about the protests in China, not any concern about spam on public transit. (The first Google hit: https://restofworld.org/2022/apple-airdrop-china-memes/.)