I signed up using a computer and never installed the app but have been getting the text message notifications. I never had the message that I needed to text #stay. Therefore, when the notifications started about "So and so hasn't responded so they'll no longer receive the messages", I understood it that if you didn't respond to the chat then you would get kicked off (I signed up at the beginning when the nice poster with good intentions created the groupme ^_^, so I was just really amused about the whole thing at the time). So it's not just some people are doing the #stay response incorrectly, but I'm sure a lot of people thought that they would get kicked off the chat if they didn't respond, especially for the newbies, who I'm sure some are panic responding because of it.