The Bluetooth aspect to it is curious and is quite shareable as this curious thing. So it's reaged a wider audience (ie outside the bitcointwitter bubble).

It's also not totally swamped with bitcointwitter chat, slogans and 'memes'.

Let's say bitchat was just the 21m room, it wouldnt be being shared, at all.

If it becomes bitcoin chatrooms everywhere it'll be dead very quickly.

Luckily the format of geohashes dilutes the intensity of this sort of content out.