It's called "agile development" .. an app is released with a core set of functionality, additional functionality is delivered during a "sprint" and continual updates/upgrades are the norm. Those are typically based on customer requests for features/functionality.
Looks to me like that's what they're doing, and they appear to be focused on Apple users first. Android users will follow and I wonder when browser based/desktop access will follow.
I refuse to use my cellphone for social media apps. That's just begging to be tracked and followed.
Are you a computer specialist? Good to hear your information.