Usually I think Parse is over. I just don't feel the power behind the development team. They show up some life signals, but if I check the trend of the related GitHub issues or the number of commits, for me it seems more like a dying sparrow than a flying eagle.
Nevertheless I like Parse. Sometimes I like Parse better than Firebase. So it was hard for me to let go my Parse supported chat application.
Since I found some free time, I rechecked Parse iOS SDK, especially the Parse Live Query. It turned out that, it's not hard to implement the same application with Parse Server (including Parse Live Query) what we have now with Firebase.
So if you find it useful or necessary to maintain your own backend instead of using Firebase, you can have a Parse Server supported chat solution with absolutely the same functionality what we have with Firebase.
As always, just send me a mail for more details.