Probably nothing really. It will work a while for frequently out of stock items when the app has a small number of users. This replaces text messaging to let ot

Probably nothing really. It will work a while for frequently out of stock items when the app has a small number of users. This replaces text messaging to let others know what's in stock. But with many users, notifying other people will just make the store run out of stock sooner. So people will revert to texting their friends to let them know when something's in stock.